最热内容

NASA sent one of two twin brothers to space for a year. Here's what happened

When NASA astronaut Scott Kelly stood up last March after spending a year in space, he was two inches taller.

25 things you can do to make yourself feel happier

Feeling a little blue lately? A handful of recent research suggests you're not alone.

Sea levels are rising at the fastest rate for 28 centuries – what does this mean for cities?

Sea levels are rising several times faster today than at any other point in roughly the last 3,000 years, according to new research.

今昔图片对比：气候变化是如何毁灭地球的

The evolutionary reason humans crave sugar