GREAT MOMENTS IN SCIENCE: It took a century of speculation and experimentation to discover gravitational waves, as Dr Karl explains.
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GREAT MOMENTS IN SCIENCE: Astronauts on the International Space Station breathe air almost identical to the stuff we breathe on Earth. Dr Karl explains where it comes from.
GREAT MOMENTS IN SCIENCE: Can you test the state of charge of a battery by dropping it and seeing how high it bounces? Dr Karl puts YouTube science to the test.