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Why do we sleep?

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“Dreadnoughtus” dwarfs 7 elephants
Researchers have been studying the remains of a dinosaur. It was bigger than seven bull elephants. The scientists call it Dreadnoughtus, or "fearing nothing." They hope its bones will help r...
Researchers have been studying the remains of a dinosaur. It was bigger than seven bull elephants. The scientists call it Dreadnoughtus, or "fearing nothing." They hope its bones will help r...
Researchers have been studying the remains of a dinosaur. It was bigger than seven bull elephants. The scientists cal...
- Posted on September 7, 2014
Does music make you smarter?
Playing an instrument just might make kids become stronger students. Researchers at Northwestern University in Illinois believe that the music training helped students do better in school....
Playing an instrument just might make kids become stronger students. Researchers at Northwestern University in Illinois believe that the music training helped students do better in school....
Playing an instrument just might make kids become stronger students. Researchers at Northwestern University i...
- Posted on September 5, 2014
Puffins have problems – want to help these birds?
A group wants bird lovers to help save Atlantic puffins from starvation in Maine. A puffin is a bird that lives near the ocean. There are about 1,000 pairs of the seabirds in the state. They...
A group wants bird lovers to help save Atlantic puffins from starvation in Maine. A puffin is a bird that lives near the ocean. There are about 1,000 pairs of the seabirds in the state. They...
A group wants bird lovers to help save Atlantic puffins from starvation in Maine. A puffin is a bird that live...
- Posted on August 6, 2014
If you were a crab, what color would you be?
A rare blue-colored red king crab was found this summer. Frank McFarland found the crab in his pot when fishing July 4. The blue crab is being kept alive at the Norton Sound Seafood Center. ...
A rare blue-colored red king crab was found this summer. Frank McFarland found the crab in his pot when fishing July 4. The blue crab is being kept alive at the Norton Sound Seafood Center. ...
A rare blue-colored red king crab was found this summer. Frank McFarland found the crab in his pot when fishin...
- Posted on August 5, 2014
Why are lakes freshwater and oceans saltwater?
Rain falls as fresh water. As this water flows downward, it ever so slightly erodes the rocks and soil. This causes a very slight amount of salt and minerals to dissolve in the water. Then they con...
Rain falls as fresh water. As this water flows downward, it ever so slightly erodes the rocks and soil. This causes a very slight amount of salt and minerals to dissolve in the water. Then they con...
Rain falls as fresh water. As this water flows downward, it ever so slightly erodes the rocks and soil. This causes a...
- Posted on June 3, 2014
What happens to you in space without a space suit?
Bad things happen, my friends. Lots of bad things. Our bodies depend on Earth's atmosphere to survive. Not just for oxygen. The atmosphere protects us from ultraviolet radiation. It regulat...
Bad things happen, my friends. Lots of bad things. Our bodies depend on Earth's atmosphere to survive. Not just for oxygen. The atmosphere protects us from ultraviolet radiation. It regulat...
Bad things happen, my friends. Lots of bad things. Our bodies depend on Earth's atmosphere to survive. Not ju...
- Posted on May 20, 2014
Can you make a man out of a monkey?
Humans and chimps are alike in many ways. We share 98 percent of our DNA with them. DNA is the basic building block of life, and includes the genes that make you who you are. You can't see DNA. ...
Humans and chimps are alike in many ways. We share 98 percent of our DNA with them. DNA is the basic building block of life, and includes the genes that make you who you are. You can't see DNA. ...
Humans and chimps are alike in many ways. We share 98 percent of our DNA with them. DNA is the basic building block...
- Posted on May 19, 2014
Which animal lives longest?
Sticking with recorded history, the answer might surprise you. It’s not elephants, which live for about 30 or 40 years. It’s not giant tortoises either, even though they often ripen to be well ...
Sticking with recorded history, the answer might surprise you. It’s not elephants, which live for about 30 or 40 years. It’s not giant tortoises either, even though they often ripen to be well ...
Sticking with recorded history, the answer might surprise you. It’s not elephants, which live for about 30 or 40 ye...
- Posted on May 15, 2014
How do microwave ovens cook food?
Here's a hint. It's really not an oven at all. Microwave ovens use microwaves. These include infra-red, visible light, ultraviolet and x-rays. Press start on your microwave oven. This fires...
Here's a hint. It's really not an oven at all. Microwave ovens use microwaves. These include infra-red, visible light, ultraviolet and x-rays. Press start on your microwave oven. This fires...
Here's a hint. It's really not an oven at all. Microwave ovens use microwaves. These include infra-red, visible ligh...
- Posted on May 14, 2014
Why do we sleep?
That's a good question. But we don't have a good answer. We know that sleep is important. Without it, we get tired and grumpy. We get headaches and can't think right. Our health suffers. Aft...
That's a good question. But we don't have a good answer. We know that sleep is important. Without it, we get tired and grumpy. We get headaches and can't think right. Our health suffers. Aft...
That's a good question. But we don't have a good answer. We know that sleep is important. Without it, we get t...
- Posted on May 13, 2014