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

NASA is conducting a study to assess how the human body changes as a result of space travel, using Scott Kelly and his twin brother Mark Kelly as subjects.

25 things you can do to make yourself feel happier

How to feel happier, according to neuroscientists and psychologists.

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