Many indigenous people live in areas of low oxygen concentration with few adverse effects. The big question is, how do they survive?
Although Everest had first been climbed in 1953, this was the first successful ascent to be made without supplemental oxygen.
The bacteria take nitrogen out of the air and make it available to other living organisms in an amazing process.
The legend of the vampire, Dracula, may have had its basis in a very real disease known as Hereditary Porphyria.
If blood is either red or blueish, depending on the presence of oxygen, why are bruises sometimes black, green, brown, or even yellow?
Scientists are developing a type of artificial blood for use in emergencies. Learn more on this Moment of Science.
For those of you who watch a lot of crime shows, this segment is for you. "Crime Scene Investigation" on this Moment of Science.
What creature has more than one heart? Find out on this Moment of Science.
The blood of an insect functions differently than the blood of a human. In humans, blood gets its red color from hemoglobin, which travels through blood vessels carrying oxygen from the lungs to the rest of the body. Insect blood, however, does not carry gasses and has no hemoglobin.