Top 5 of 2018

A climate warning, a redefining moment, an industry takes off and a questionable claim. These are some of the biggest science stories of the year.

Latest videos

The five tastes

1:56
Video: The five tastes

Why chocolate makes us happy

2:04
Video: Why chocolate makes us happy

Could a cat parasite make you irrational?

1:28
Video: Could a cat parasite make you irrational?