/u/journalofassociation's posts in /r/askscience

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What happens in our brains when we are very tired, "exhausted" or "burned out"?

880 upvotes

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If coherent light is required to reproduce a hologram, how can I view the holograms in my driver's license (or other common sources) under a standard light source.

5 upvotes

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Why is the acceleration of the bob (end) of a pendulum at its maximum acceleration when it reaches its rest point at the end of its period?

0 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What happens in our brains when we are very tired, "exhausted" or "burned out"?	880
If coherent light is required to reproduce a hologram, how can I view the holograms in my driver's license (or other common sources) under a standard light source.	5
Why is the acceleration of the bob (end) of a pendulum at its maximum acceleration when it reaches its rest point at the end of its period?	0