Science

New evidence suggests humans arrived in the Americas far earlier than thought
Until now, the earliest signs of humans in the Americas dated back about 15,000 years. But new research puts people in California 130,000 years ago. Experts are wondering whether to believe it.
One of many March for Science rallies around the country will happen in St. Paul on Saturday at the state Capitol, where a feud has broken out over funding for environmental programs.
An asteroid is swinging by Earth today for its closest visit in 400 years
Don't worry: Astronomers say asteroid 2014 JO25, which is more than a third of a mile wide, will fly harmlessly past our planet. Still, it should come close enough to be visible with small telescopes.
Facebook's new grand plan to draw you in
In quintessential Silicon Valley style, Facebook CEO Mark Zuckerberg unveils ambitious plans to bring users from 2D Newsfeeds to 3D imaginary worlds; and neglects safety concerns.