Spy agencies have high hopes for AI

This isn’t their first attempt

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Face-masks can give the immune system a helpful hand

The key is humidity—and snot

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The race to teach sign language to computers

Paying attention to what deaf users actually want is vital

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Seagrasses and mangroves can suck carbon from the air

They do an even better job than forests on land

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SpaceX is making progress on its next rocket

But it still has a long way to go

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Cracking the security on a trove of 17th century letters

Before envelopes, there was “letterlocking”

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Spy agencies have big hopes for AI

This isn’t their first attempt

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Dusting the upper atmosphere could help counter climate change

An experiment to test the idea could soon start in Sweden

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The newest Mars rover videoed its own landing

It involved parachutes, retro-rockets and cables

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Hydrogen goop could be a more convenient fuel than hydrogen gas

At least, the Fraunhofer Institute hopes so

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