'Disease tolerance' is the ability of an individual, due to a genetic predisposition or some aspect of behavior or lifestyle, to thrive despite being infected with an amount of pathogen that sickens others. It might play a role in asymptomatic coronavirus infections.
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Several influenza vaccines have been made in the form of a nasal spray, instead of an injection. The sprays confer two kinds of immunity to the recipient but can be difficult technologically to make.
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Since its completion in 1963, the Arecibo Observatory has played a key role in discoveries ranging from new insights into pulsars to detecting planets outside our solar system.
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The Pacific Ocean from space. In both liquid and frozen form, water covers most of the Earth's surface, and there's been a debate among scientists about where all the water originated.
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