Tuesday, May 29, 2018

PREMATURE AGING



THE SEVEN MOST COMMON FACTORS IN PREMATURE AGING
Aging is the natural process of growing older. Yet there are many factors that play a role in whether we age gracefully or if we are the one out of two people who are faster than our biological age.
More than half of us look older than we really are because we either engage in behaviours that increase our aging, or we do not actively support a more youthful body through inaction. Knowledge is power, and the more you know about fighting the aging process, the more control you can take toward maintaining a healthier, younger body and mind.
Image result for premature aging
1- PREMATURE AGING AND ATTITUDE
The mind plays a significant role in whether we are aging faster or slower, and we can use the mind to help us accelerate or decelerate the process. Happier people are quite simply younger looking people. The more you hold hope, optimism, and joy at the top of your list of priorities, the younger your face will appear. Moreover, happier people live longer often with fewer health problems like heart disease, high blood pressure, and even aching joints and bones.
Perpetual anger and distress can form permanently on the face in the form of fine lines and deep wrinkles. When the face expresses chronic sad or angry emotions, the constant scowling can turn into wrinkles formed by muscle memory.

A happier face is devoid of wrinkled eyebrows and scowl marks because the muscles have spent more time in a relaxed state. This doesn’t mean that one bad day will give you a face full of wrinkles, but how your face carries your expression more than 50% of the time can determine how prematurely you form wrinkles, where, and how deeply.

2- AGING, SMOKING, AND DRINKING
Image result for premature agingWe all know that smoking and drinking in excess are not good for us. They lead to all kinds of health problems and deplete our bodies of necessary nutrients. Additionally, the lines and discoloration of a smoker or drinker are worn all over their face. The skin needs a certain amount of hydration, collagen, elastin, and oxygen in order to look youthful and healthy.

Smokers develop fine lines around the mouth, deeper forehead wrinkles, and are twice as likely to develop bad teeth. The entire body, including the facial skin, is deprived of enough oxygen and the look and feel of a smoker’s face can be obvious over time.
Drinking excessively can leave permanent marks on the body as well. Aside from the damaging effects on the liver and kidneys, heavy drinkers have facial skin that has been discoloured over time, has poor muscle tone, and often has broken blood vessels or small spider veins.

3- AGE, SUN, COLD, AND MOISTURE
We can easily accelerate our aging process by basking in the sun’s rays. Sun damage is the number one cause of wrinkles and skin that has been permanently damaged.
Age spots and other forms of discoloration can be seriously exacerbated by the sun’s harmful UV rays. A face that has spent years working on its tan appears heavily wrinkled and touch like show leather. Once you pass the twenty-minute mark in the sun, the benefits from absorbing necessary Vitamin D are counteracted by the damage of the UV rays to the skin.
Spending a life time in cold environments can have a similar effect. Rather than creating a tougher skin, the skin appears too thin and wrinkles develop. The same effect can be seen in people who use harsh acne treatments over a period of years.

When acne treatments dry out the skin, it can cause damage similar to the damage caused by cold and sun, creating a dry, tough, wrinkled face. When the skin’s natural oils are depleted, the skin loses its elasticity and the face ages. Moisturizing daily, sometimes two and three times per day, and protecting the skin for the sun and damaging cold can combat these rather common effects on our aging process.

4- AGING AND DIET
One of the most commonly misunderstood aging factors is the effect that food has on the body. There are foods that you can eat that will help you retain a younger body and foods that will help age you faster. Choosing a diet that is high in fats, sugars, processed foods, and low in fresh fruits and vegetables creates an internal environment that is anything but youth friendly.
Image result for premature agingFoods that cause inflammation, like refined sugar, white flour, and even excessive dairy products, can readily create inflammation in the body that contributes to the aging process. These foods tend to make the body “heavier” in feel and appearance because the internal organs are actually suffering from inflammation. Aside from this, our bodies do not process foods that are not in their natural form very well, which means the organic breakdown of nutrients is not being put to biological good use.
Replacing a sugary diet with fried and fatty foods, even if you are not overweight, with one that is high in natural products can keep the whole body looking tighter and younger.

5- AGING AND WEIGHT
Being too thin or too heavy can add to the aging process. Being underweight reduces the natural fats in the facial structure which allows the skin to sag and adds to the appearance of wrinkles. A face lift or Botox doesn’t help an underweight face look younger because the natural fattiness that fills out the face can’t be replaced with medical procedures like these.

Simply adding five pounds to an underweight body can bring back a softer, wrinkle free face. Too much weight can make us look older by creating poor muscle tone.
Overweight people, especially as they age, tend to be less active and this leads to chronic health problems and the cycle of aging continues.

Even in your forties, fifties, sixties, and sometimes beyond, putting on a few extra pounds doesn’t mean that you have to carry around a spare tire. Rather, targeted exercise can keep your entire body in shape while adding muscle reduces the flabby, wrinkly look that too much fat can produce.
People who have suffered from eating disorders also tend to develop wrinkles, dry skin, and skeleton like features as they reach their thirties and forties. The body has spent an extended period of time malnourished, even if it was fifteen or twenty years before.
The effects of this phenomenon can be combated through a diet rich in antioxidants, fresh, natural foods, and ample muscle building exercise that does not result in excessive weight loss. Since the metabolism was effected during the time of the eating disorder, those who have recovered should periodically see a nutritionist to develop high energy, low fat, age fighting dietary plans.

6-AGING AND CHOICES
We all make daily choices that either help or hinder the aging process. Regular work outs can help prevent premature aging and keep the entire body in great shape.
Choosing television in the evening over physical exertion can lead to premature aging.
The chronic use of harsh chemicals on and around the body can add to aging, not to mention disease.
Everything from finger nail polish to natural products that make you feel good (aka high) and the medications that we pump into our body can have age related side effects.
The closer we can get back to the natural form our bodies crave, the less likely we are to see our body’s age right in front of our eyes.

Making choices that work with our body rather against it can help slow down the aging process. Learning to listen to your body can change everything. Stop eating when you’re full. Rest when you’re tired. Focus on yourself in a way that you never have before.
Turn toward natural interventions when possible instead of chemical alterations for turning back the clock. These are simple choices that work with our bodies’ own natural rhythm and pay us back in dividends beyond belief.

7-AGING AND STRESS
Chronic, high stress lives are a good recipe for aging. Aside from the effects that a worried face has on facial wrinkles, stress affects everything from the way we carry ourselves to our energy level. People who are consumed with daily stress do not walk tall and proud like people who are feeling good about themselves. They move slower and they challenge their bodies less. People who are overwhelmed with stressed also tend to have illnesses that can help the aging process along.
A certain amount of stress is actually good for us, although stress that creates physical signs on the body should be handled on a pleasant and relaxing manner.

Grab a weekly massage and practice calm forms of exercise like Yoga. Meditation can also help improve your overall stress level, which can make you feel more focused and younger.
While we can’t keep those birthdays from rolling around in our direction, we can take affirmative action to keep the aging process from taking over our lives. With less stress, better diet and exercise, and a happier outlook, we can retain our youthful joy and keep our spirits much younger. The youthful joy on the inside will be noticeable on the outside.

THE EFFECTS OF AGING ON SKIN
Our skin is at the mercy of many forces as we age: sun, harsh weather, and bad habits. But we can take steps to help our skin stay supple and fresh-looking.
How your skin ages will depend on a variety of factors: your lifestyle, diet, heredity, and other personal habits. For instance, smoking can produce free radicals, once-healthy oxygen molecules that are now overactive and unstable. Free radicals damage cells, leading to, among other things, premature wrinkles.

There are other reasons, too. Primary factors contributing to wrinkled, spotted skin include normal aging, exposure to the sun (photo aging) and pollution, and loss of subcutaneous support (fatty tissue between your skin and muscle). Other factors that contribute to aging of the skin include stress, gravity, daily facial movement, obesity, and even sleep position.

SKIN CHANGES THAT COME WITH AGE
As we grow older, changes like these naturally occur:

Skin becomes rougher.

Skin develops lesions such as benign tumors.

Skin becomes slack. The loss of the elastic tissue (elastin) in the skin with age causes the skin to hang loosely.

Skin becomes more transparent. This is caused by thinning of the epidermis (surface layer of the skin).

Skin becomes more fragile. This is caused by a flattening of the area where the epidermis and dermis (layer of skin under the epidermis) come together.

Skin becomes more easily bruised. This is due to thinner blood vessel walls

Changes below the skin also become evident as we age. They include:
Loss of fat below the skin in the cheeks, temples, chin, nose, and eye area may result in loosening skin, sunken eyes, and a "skeletal" appearance.

Bone loss, mostly around the mouth and chin, may become evident after age 60 and cause puckering of the skin around the mouth.

Cartilage loss in the nose causes drooping of the nasal tip and accentuation of the bony structures in the nose.

SUN AND YOUR SKIN
Exposure to sunlight is the single biggest culprit in aging skin.
Over time, the sun's ultraviolet (UV) light damages certain fibers in the skin called elastin. The breakdown of elastin fibers causes the skin to sag, stretch, and lose its ability to snap back after stretching. The skin also bruises and tears more easily and takes longer to heal. So while sun damage may not show when you're young, it will later in life.

Nothing can completely undo sun damage, although the skin can sometimes repair itself. So, it's never too late to begin protecting yourself from sun exposure and skin cancer. You can delay changes associated with aging by staying out of the sun, covering up, wearing a hat, and making a habit of using sunscreen. 

SKIN CONDITIONS IN THE ELDERLY
As we get older, our skin undergoes a number of changes. How skin ages will depend on several factors: your lifestyle, diet, heredity, and other personal habits (such as smoking).
Sun exposure is the main cause of skin damage. Skin damage from the sun is due to the sun's ultraviolet (UV) light, which breaks down elastic tissue (elastin) in the skin and causes the skin to stretch, sag, wrinkle, and become blotchy, occasionally with pre-cancerous growths and even skin cancer.
Other factors contributing to skin aging include the loss of fatty tissue between your skin and muscle (subcutaneous support), stress, gravity, daily facial movement (smiling and frowning, for example), and obesity.

SKIN CHANGES THAT ACCOMPANY AGING INCLUDE:
Roughened or dry skin
Benign growths such as seborrheic keratosis and cherry angiomas
Loose facial skin, especially around the eyes, cheeks, and jowls (jawline)
Transparent or thinned skin
Bruising easily from decreased elasticity

COMMON SKIN CONDITIONS IN THE ELDERLY
Wrinkles: Wrinkles are the most visible sign of aging skin. They follow chronic sun exposure and form when the skin loses its flexibility. Smokers tend to have more wrinkles than nonsmokers.
Facial movement lines: These lines (often known as "laugh lines" and "worry lines") become more visible as the skin loses its elasticity (in your 40's or 50's). The lines may be horizontal on the forehead, vertical above the nose, or curved on the temples, upper cheeks, and around the mouth and eyes.

Dry and itching skin: Dry, flaking skin is a common problem among adults, especially the elderly. The loss of oil glands (which help to keep the skin soft) is the main cause of dry skin. Rarely, dry, itchy skin may be a sign of diabetes, kidney disease, or liver disease.
Skin cancer: Sun exposure (UV radiation) is the most common cause of pre-cancers and skin cancer, either basal cell carcinoma or squamous cell carcinoma. Many Americans (a million each year) will develop a skin cancer by age 65.

Age spots: "Age spots" are brown patches that appear on sun-exposed parts of the body (face, hands, and forearms), usually during the adult years.
Bedsores: Bedsores (also known as pressure ulcers) are skin ulcers that develop from pressure when people lie in bed or sit in a chair for long periods of time. Bedsores are a fairly common problem in elderly people who have difficulty moving on their own. People with diabetes are more prone to bedsores because of their poor circulation and decreased feeling in their skin. Frequent rotation or re-positioning helps to prevent.



Wednesday, May 23, 2018

What causes our skin to age?

What causes our skin to age?

 Many things cause our skin to age. Some things we cannot do anything about; others we can influence.
Image result for aging years
One thing that we cannot change is the natural aging process. It plays a key role. With time, we all get visible lines on our face. It is natural for our face to lose some of its youthful fullness. We notice our skin becoming thinner and drier. Our genes largely control when these changes occur. The medical term for this type of aging is “intrinsic aging.”
Image result for aging yearsWe can influence another type of aging that affects our skin. Our environment and lifestyle choices can cause our skin to age prematurely. The medical term for this type of aging is “extrinsic aging.” By taking some preventive actions, we can slow the effects that this type of aging has on our skin.

11 ways to reduce premature skin aging

The sun plays a major role in prematurely aging our skin. Other things that we do also can age our skin more quickly than it naturally would. To help their patients prevent premature skin aging, dermatologists offer their patients the following tips.
  1. Protect your skin from the sun every day. Whether spending a day at the beach or running errands, sun protection is essential. You can protect your skin by seeking shade, covering up with clothing, and using sunscreen that is broad-spectrum, SPF 30 (or higher), and water-resistant. You should apply sunscreen every day to all skin that is not covered by clothing.
  2. Apply self-tanner rather than get a tan. Every time you get a tan, you prematurely age your skin. This holds true if you get a tan from the sun, a tanning bed, or other indoor tanning equipment. All emit harmful UV rays that accelerate how quickly your skin ages.
  3. If you smoke, stop. Smoking greatly speeds up how quickly skin ages. It causes wrinkles and a dull, sallow complexion.
  4. Avoid repetitive facial expressions. When you make a facial expression, you contract the underlying muscles. If you repeatedly contract the same muscles for many years, these lines become permanent. Wearing sunglasses can help reduce lines caused by squinting.
  5. Eat a healthy, well-balanced diet. Findings from a few studies suggest that eating plenty of fresh fruits and vegetables may help prevent damage that leads to premature skin aging. Findings from research studies also suggest that a diet containing lots of sugar or other refined carbohydrates can accelerate aging.
  6. Drink less alcohol. Alcohol is rough on the skin. It dehydrates the skin, and in time, damages the skin. This can make us look older.
  7. Exercise most days of the week. Findings from a few studies suggest that moderate exercise can improve circulation and boost the immune system. This, in turn, may give the skin a more-youthful appearance.
  8. Cleanse your skin gently. Scrubbing your skin clean can irritate your skin. Irritating your skin accelerates skin aging. Gentle washing helps to remove pollution, makeup, and other substances without irritating your skin.
  9. Wash your face twice a day and after sweating heavily. Perspiration, especially when wearing a hat or helmet, irritates the skin, so you want to wash your skin as soon as possible after sweating.
  10. Apply a facial moisturizer every day. Moisturizer traps water in our skin, giving it a more youthful appearance.
  11. Stop using skin care products that sting or burn. When your skin burns or stings, it means your skin is irritated. Irritating your skin can make it look older.

Note: Some anti-aging products prescribed by a dermatologist may burn or sting. When using a prescription anti-aging product, this can be okay. Just be sure to let your dermatologist know.

Never too late to benefit

Even people who already have signs of premature skin aging can benefit from making lifestyle changes. By protecting your skin from the sun, you give it a chance to repair some of the damage. Smokers who stop often notice that their skin looks healthier.
If signs of aging skin bother you, you may want to see a dermatologist. New treatments and less-invasive procedures for smoothing wrinkles, tightening skin, and improving one’s complexion are giving many people younger-looking skin.
Thank you

Thursday, May 17, 2018

CANCER 

Cancer—it’s scary word, and a scary disease. Cancer kills a lot of people all over the world. Only heart disease kills more Americans.
But there’s good news too. Millions of people who have had cancer are still alive. Doctors have learned a great deal about treating and preventing cancer.

WHAT IS CANCER?

Image result for cancerCancer is not a single disease. It includes more than 100 different diseases. They may affect any part of the body. But they have one thing in common. They are all caused by cells that are out of control.
Image result for cancerAll living things are made up of cells. An adult human body has about 30 trillion cells—that’s 30,000,000,000,000! Cells reproduce (make more cells) by dividing in half. In an adult body, about 25 million cells divide every second. That’s how the body heals itself.
Sometimes a cell goes out of control and divides over and over. And that’s what cancer is—unhealthy cells, growing and reproducing out of control. These cells are said to be cancerous.

WHY CANCER IS DANGEROUS

When cancerous cells multiply, they form clumps called tumours. Tumours can interfere with important body processes. Cancer of the lungs, for instance, interferes with breathing. Cancer of the stomach interferes with digesting food.
Cancerous cells can also spread to other parts of the body. Then new tumours form. This spreading is called metastasis. Cancer that has metastasized is the most dangerous. When cancer attacks several parts of the body, it is hard to stop.

HOW DOCTORS TREAT CANCER

The best weapon against cancer is detecting it at an early stage before it grows very much. Regular check-ups by a doctor can detect cancer before it grows and spreads. People whose cancers are discovered early usually survive.
Some cancerous tumours can be removed by surgery. Doctors must remove some surrounding healthy cells, too, to be sure they get all the cancerous cells.
Radiation, such as X rays, can also kill cancer cells. So can treatment with powerful drugs, called chemotherapy. Unfortunately, these treatments destroy healthy cells too. They can make people very sick. Newer treatments encourage the body’s own disease-fighting immune system to destroy cancer cells. But the newer treatments don’t work for all types of cancer.

WAYS TO PREVENT CANCER

There is no sure way to avoid cancer. But there are things people can do to greatly reduce the risk of getting cancer.
Smoking causes cancer. People who smoke get lung cancer 20 times more often than people who don’t smoke. Don’t smoke!
Doctors suspect that eating certain foods can also increase the chances of getting cancer. Eating lots of red meat and other foods high in saturated fat may make people more likely to develop cancer.
Most skin cancer is caused by too much Sun. Avoid getting sunburned. If everyone wore sunscreen or stayed out of the Sun, most cases of skin cancer would be prevented.

OSAMA BIN LADEN IS BACK

OSAMA BIN LADEN

Osama bin Laden inherited great wealth from his family. A follower of the religion of Islam, bin Laden used his fortune to wage war against countries he saw as enemies of the Islamic religion.


EARLY LIFE

Osama bin Laden was born in Saudi Arabia, a country in the Middle East. His father owned a big construction company. Like most other Saudi Arabians, the bin Laden’s were followers of Islam. People who follow Islam are called Muslims.
Young Osama embraced a special view of Islam. He accepted fundamentalist teachings. He believed that Muslims should live as they did when Islam began 14 centuries ago.

WHAT DID BIN LADEN WANT?

Image result for osama bin ladenBin Laden wanted to fight those who he saw as enemies of Muslims. In 1979, he got his chance. A communist country, the Soviet Union, invaded Afghanistan, a Muslim country. Bin Laden went to Afghanistan to fight the Soviets. 
In 1988, while in Afghanistan, bin Laden founded a group called al-Qaeda. (Al-Qaeda is an Arabic phrase that means “the Base”.) Bin Laden wanted al-Qaeda to lead a jihad (holy war) against all nations that he considered to be against Islam.
In 1989, the Soviets left Afghanistan. Bin Laden returned to live in Saudi Arabia. Then in 1991, the United States led a war against the Muslim country of Iraq. During that war, the United States based troops in Saudi Arabia. Now bin Laden declared that the United States was the main enemy of Islam.

BIN LADEN AND TERRORISM

In 1992, bin Laden moved to Sudan, an African country ruled by Muslims. From there, he began to direct terrorist attacks by al-Qaeda. In a terrorist attack, individuals or small groups hurt or kill ordinary people. They do this to create fear among their enemies.
Bin Laden was accused of planning several big terrorist attacks over the next eight years. In 1993, a bomb damaged the World Trade Center in New York City. In 1996, terrorists blew up an apartment building in Saudi Arabia, where many Americans lived. In 1998, two U.S. embassies in Africa were bombed, killing hundreds of people. In 2000, an attack on the U.S. Navy ship Cole killed 17 sailors.

TERRORIST ATTACKS ON AMERICAN SOIL

Then came al-Qaeda’s biggest terrorist attack of all. On September 11, 2001, a group of men hijacked four airplanes. They flew two of them into the twin towers of the World Trade Center. Another airplane crashed into the Pentagon near Washington, D.C. Another crashed in Pennsylvania. The attacks killed about 3,000 people.
The United States struck back by bombing Afghanistan. That’s where bin Laden was hiding as a guest of the country’s ruling group. The bombing forced this group, the Taliban, to flee. But bin Laden was not found.




DINOSAURS EVOLUTION


DINOSAURS

Imagine walking through a prehistoric forest and coming face to face with a terrifying dinosaur. This could never have happened, of course. People and dinosaurs did not live on Earth at the same time. Dinosaurs died out long before people appeared. Dinosaurs lived from about 230 million years ago to about 65 million years ago.

HOW DO WE KNOW ABOUT DINOSAURS?

Image result for DINOSAURS?Paleontologists (scientists who study prehistoric life) learn about dinosaurs by studying fossils of their bones. These fossils are the remains of dead animals that have turned into rock.
Image result for DINOSAURS?People probably found fossils of dinosaur bones thousands of years ago but did not know what the bones were. In the early 1800s, people realized that the fossil bones belonged to prehistoric animals. The first dinosaurs that paleontologists studied were named Megalosaurus and Iguanodon. The bones looked like those of reptiles, such as lizards. more details https://miracleawesome.blogspot.com/ The flat teeth of Iguanodon showed that it was a plant eater. The pointy teeth of Megalosaurus showed that it was a meat eater.
The early fossils came from England. British scientist Sir Richard Owen in 1842 named these animals dinosaurs. The word comes from two Greek words meaning “terrible” and “lizard.” Scientists now know that dinosaurs were not lizards.

KINDS OF DINOSAURS
Paleontologists have found fossils of hundreds of different kinds of dinosaurs that lived all over the world. Some dinosaurs were small like birds. Other dinosaurs were much bigger than an elephant.
Paleontologists divide dinosaurs into two groups, or orders, by the way their hips looked. One group had hips that were like birds’ hips. They called this order Ornithischia. The other group had hips like those of lizards. They called this order Saurischia.
There were three basic kinds of dinosaurs in the Saurischia order: theropods, prosauropods, and sauropods. There were five basic kinds of dinosaurs in the Ornithischia order: stegosaurs, ankylosaurs, ornithopods, pachycephalosaurs, and ceratopsians.

THEROPODS
All dinosaurs were plant eaters except for theropods. Theropods were meat eaters that hunted plant-eating dinosaurs and smaller theropods. Most theropods walked on their two hind legs. One of the most famous theropods is Tyrannosaurus rex. This dinosaur was about 39 feet (12 meters) long and weighed 5 metric tons.
Some theropods were called raptors. Velociraptor and other raptors had powerful claws, like the claws of an eagle. These dinosaurs probably hunted in packs.

PROSAUROPODS
Prosauropods had spoon-shaped teeth and long, slender necks. These large, plant-eating dinosaurs stood on two legs and grazed on tall bushes and trees. One type of prosauropod, Plateosaurus, was 30 feet (9 meters) long and weighed 1.8 metric tons.

SAUROPODS
Sauropods descended from prosauropods. Some of the best-known sauropods were Apatosaurus and Diplodocus. These dinosaurs had thick legs and feet like elephants’ feet, but with claws. They walked on four legs. At one time sauropods were the biggest dinosaurs on Earth. Some sauropods may have been more than 82 feet (25 meters) long and weighed about 90 metric tons.

STEGOSAURS
These ornithischians walked on four legs and had a row of bony plates down their back. Stegosaurus, a large stegosaur, also had spikes on its tail. It used its spiked tail for fighting off meat-eating theropods. Stegosaurus was about 30 feet (9 meters) long.

ANKYLOSAURS
These dinosaurs were covered with bony plates that acted as body armor to protect them against theropods. Some had a bony plate in each eyelid and large clubs on their tails. Bony rings and spines protected their necks. Ankylosaurus was about 33 feet (10 meters) long.

ORNITHOPODS
Ornithopods were once the most numerous plant-eating dinosaurs. There were many different kinds. Over time, ornithopods developed broad beaks. These later ornithopods are called duck-billed dinosaurs. Some ornithopods were small and ran fast. Others were huge. Iquanodon, for example, was 25 feet (7.5 meters) long.

PACHYCEPHALOSAURS
These dinosaurs walked on two feet. They had thick, dome-shaped skulls. Scientists think they may have used their thick heads to butt other dinosaurs.

CERATOPSIANS
These dinosaurs ware also called horned dinosaurs. One of the best-known ceratopsians was Triceratops. It had three horns on the top of its head: one horn on its snout and one horn above each eye. Triceratops could reach lengths of up to 26 feet (8 meters) and weighed more than 12 metric tons.

WHAT HAPPENED TO THE DINOSAURS?
There are several theories about why dinosaurs died out. Many scientists believe that there was a sudden, violent event. They think that an asteroid or comet collided with Earth. Fire from the impact burned large areas. Dust blocked sunlight from reaching the surface of Earth. Acid rain fell everywhere. Plants could not grow. There was no food for the plant-eating dinosaurs, so they died out. Dinosaurs that ate plant-eating animals also died out.
Other scientists think that the environment changed. Maybe the climate grew colder and dinosaurs slowly became extinct over several million years.
Many scientists think that birds descended from a small kind of dinosaur. If this is true, then dinosaurs, in a sense, are still alive in the form of modern birds.