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How do astronauts breathe in space?

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.


Does the bouncing battery test work?

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.

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