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Abakcus
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Abakcus is the best curation site for math and science. http://instagram.com/abakcus
Jay Merin
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Atheist; Nerd/Geek; #Cyclops #B5 #JLU #Robotech #BtVS #TheExpanse #Earpers; left of center; RIP Douglas Adams Marie Fredriksson George Carlin Richard Donner