What is penicillin, and how was it discovered?
Discovered by sheer accident in the late 1920s, penicillin was the world's first antibiotic.
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EXPLAINED: 2 - The Real Truth
How does sunscreen work?
Sunscreens work in two ways: either by blocking harmful UV rays from reaching the skin, or by converting the rays into heat that can be released from the body.
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