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- Earth
A WWII submarine-hunting device helped prove the theory of plate tectonics
With a boost from World War II, the fluxgate magnetometer became a portable and invaluable tool.
- Health & Medicine
What experts know so far about the delta variant
The variant, which first emerged in India, is outcompeting other highly transmissible forms of the coronavirus as it spreads around the world.
- Astronomy
Scientists spotted an electron-capture supernova for the first time
A flare that appeared in the sky in 2018 was an electron-capture supernova, a blast that can occur in stars too small to go off the usual way.
