Restoration of an American mastodon herd by Charles R. Knight

This Week in Sustainability: From Ice Age to Internet Age, Scientists Look for Clues to Species’ Extinctions

Scientists explore the causes--climate change, habitat destruction, and more--that decimated animals and humans alike, from Ice Age to Internet Age.
Chili peppers

The Science of Hot Chili Peppers

Why do spicy foods feel hot? A look at the science behind the world's spiciest hot chili peppers, including the new "Dragon's Breath" variety.
Haumea, a dwarf planet

The Weirdest Dwarf Planets Discovered So Far

The solar system is apparently more crowded than we thought: astronomers have discovered a new dwarf planet. Some dwarf planets don't play by the rules.
Suburban Lawn

Your Green Lawn is Harming the Environment

Americans go to desperate measures to keep their lawns manicured and green. But is it worth the environmental cost?