Have you ever wonder why bananas seem to go bad so quickly?
Turning blue in the face is easier said than done.
Global warming is depleting oxygen in the water, creating and expanding "dead zones" toxic to sea life.
We can manufacture ozone molecules from oxygen, but not enough to patch up the ozone layer.
Since the beginning of human civilization, Earth has lost half its trees.
It's a gas! Air consists of nitrogen and oxygen and lots of empty space.
Stick with the fly traps or swatters...you can't choke out these pesky pilots.
Scientists are engineering a method for turning solar energy into fuel.
Birds and many reptiles evolved a specialized way of breathing—one-way air flow.