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Math

Real numbers don’t cut it in the real world, this physicist argues

Physicist Nicolas Gisin argues that real numbers don’t properly represent the natural world, which is a good thing for free will.

Astronomy

New ideas about how stars die help solve a decades-old mystery

New ideas about stellar evolution help explain why astronomers see so many bright planetary nebulae where they ought not be.

Climate

Globetrotting tourists are leaving a giant carbon footprint on the Earth

Globetrotters are responsible for about 8 percent of the world’s greenhouse gas emissions.

Animals

Here’s how to use DNA to find elusive sharks

Hard-to-find sharks that divers and cameras miss appear in genetic traces in the ocean.