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How to watch NASA’s DART spacecraft hit an asteroid tonight

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Malaria cases surged in Central America after a fungal pandemic wiped out frogs

Malaria cases surged in Central America after a fungal pandemic wiped out frogsMalaria cases surged in Central America after a fungal pandemic wiped out frogs

The study offers one of the clearest links yet between biodiversity and public health.

NASA tests new asteroid-defense system even as it slashes funding for its mission to spot killer space rocks

NASA tests new asteroid-defense system even as it slashes funding for its mission to spot killer space rocksNASA tests new asteroid-defense system even as it slashes funding for its mission to spot killer space rocks

There are more than 10,000 asteroids known in near-Earth orbits of “city-buster” size. NASA is putting off a mission to find the ones we don’t know about.

‘No Dumb Questions’: Why is fentanyl killing so many people?

‘No Dumb Questions’: Why is fentanyl killing so many people?‘No Dumb Questions’: Why is fentanyl killing so many people?

A drug that has helped millions is also killing tens of thousands of Americans. Grid’s science reporter explains why.

‘Rainbow fentanyl’ is the latest twist in the opioid crisis — and shows how illegal drug dealers are adapting

‘Rainbow fentanyl’ is the latest twist in the opioid crisis — and shows how illegal drug dealers are adapting‘Rainbow fentanyl’ is the latest twist in the opioid crisis — and shows how illegal drug dealers are adapting

The illicit market for pain pills never went away. Now fake ones are flooding the street and causing even higher rates of overdose deaths.