Why Are Plants Green?
The dominance of green chlorophyll on Earth may have come after a more purple period.
The dominance of green chlorophyll on Earth may have come after a more purple period.
You probably have heard that hair is made up of dead cells. But are living cells really "alive"?
Why you sometimes feel a cold coming on, only to have the symptoms disappear the very next day.
Have you ever been to a high altitude and found yourself gasping for breath? One listener asked why …
Gender stereotypes about extreme intelligence take hold in the early school years.
Researchers turn to panels of taste testers to identify key flavor chemicals lost during the past …
Objects like blankets and stuffed animals can theoretically spread illnesses, but it’s unlikely.