Naturally formed chalk rock could be described as a graveyard for plankton.
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?
Have you had to scrub your bathtub to get rid of soap scum? Learn why soap doesn't dissolve in your water.
The ancient Greeks knew a thing or two about, well, about a lot of things. For example, they built outdoor amphitheaters with amazing acoustics.