Physics
Physics explains why gold doesn’t ‘rust’
Metals like copper tarnish when they react with oxygen in the air. Gold doesn’t, thanks to a quick rearrangement of atoms on its surface.
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Space
Scientists Say: Event horizon
Past this boundary, nothing that enters a black hole can ever leave — not even light.
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Earth
Could a storm last forever?
Thunderstorms help fix imbalances found in our atmosphere. For constant storms, those imbalances would have to persist.
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Earth
Analyze This: A rocket reentry spiked metal levels in the atmosphere
Detection of lithium from a SpaceX rocket reentering the atmosphere offers new evidence that space debris could harm the ozone layer.
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This tool-using cow stunned scientists with her smarts
Veronika the cow scratches hard-to-reach body parts using a brush. This feat is forcing scientists to rethink which animals can use tools.
