› added 9 years ago

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TIL of a region near a black hole called a photon sphere where the gravitational pull is so strong that light photons orbit it, meaning if you were at that point and turned to the side, you could see the back of your own head.

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X0aGr TIL the literacy rate grew in India by 97% between 2001 and 2011. The literacy rate among women is 70% and 85% for men.
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