Many indigenous people live in areas of low oxygen concentration with few adverse effects. The big question is, how do they survive?
In movies like Call of the Wild, huskies pull sleds for hundreds of miles over the Alaskan tundra. A Moment of Science wonders, what kind of dogs are sled dogs?
If you have a runny nose and a fever, you'll need to drink more to replace those lost fluids. But why?
Some simple sugars detected by astronomers, glycoaldehydes, are thought to be the basic building blocks of life.
The body must produce the liquid part of blood, called plasma, and the cells that float in it.
Scientists have found fossilized remains of dragonflies with wingspans several feet in diameter.
Reading ads for antioxidant supplements, you'd think you'd found the fountain of youth. What are antioxidants and how do they work?
I have a friend who says there's not much oxygen on earth. Ever since I heard that I can't catch my breath! What's the truth?
If you needed to know what the weather was like in Singapore tens of millions of years ago, you'd have to consult a different source.
Mountain climbers face many dangers as they brave the cold winds of the peaks they climb. But the most serious thing they face is all in their heads--literally.