The 3,100-mile Olympic torch relay is underway. Here's what to know about the symbolic tradition.

Himalayan Glaciers Are Melting 65% Faster Than Just 10 Years Ago

The World's Rivers Are All Backed Up, Leaving Fish With No Place To GoThis Is The Best Type of Water Bottle You Should Be Using, According to Science

The Amount of Food Americans Waste Every Day Is More Shocking Than Thought, Study ShowsIntense Ocean Currents Could Be Created by Ridiculously Tiny Marine 'Insects'The Great Barrier Reef Has Been Forever Damaged Due to Massive Coral Deaths, Study Shows

A Shockingly Small Number of Earth's Population Still Have Access to Unpolluted AirScientists Have Identified The Secret That Fuels Yellowstone's Explosive Hellfire

An Invisible Boundary That Divides The US Has Started to Shift Out of Place

Scientists Have Accidentally Created a Mutant Enzyme That Eats Plastic WasteEnergy-Saving LED Lighting Has Backfired in a Spectacular Way

Exotic Australian Plants Have Superpowers That Can Be Used to Clean Up Chemical SpillsHere's What You Need to Know About That Mysterious Radiation Cloud Over Europe

The Asteroid That Killed Dinosaurs Triggered a Worse Global Disaster Than Ever ImaginedHere's Another Reason The Global Warming 'Hiatus' Never Actually Happened