Earth Matters

NASA is growing Martian gardens to prepare for life on Mars

11 of the most endangered trees in America

Can artificial insemination save the Mexican wolf from extinction?

Obama's national monuments are a big deal

8 species on life support

Why are fireflies disappearing?

5 surprising facts about roadrunners

Striking mother-of-pearl clouds may have inspired 'The Scream'

Mom? … Anybody? Adorable bear cub needs a hand with clingy scallop

Town bids farewell to 600-year-old oak

Houston, we have a space debris problem

Common caterpillar found to eat plastic shopping bags