3d
Why you can remember every word of a song from 25 years ago – but not why you walked into the room
Forgetting why you walked into a room isn’t a sign of cognitive decline. It’s your brain doing exactly what it evolved to do.
The extreme speed at which light moves, and the fact that photons do not tend to interact with transparent matter, is of enormous benefit to mankind. It allows us to see deep into the Universe and to ...
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