/u/thermal7's posts in /r/askscience
If a person has been depressed for a long time, is there some kind of 'damage' to their brain, and can anti-depressants reverse the damage?
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Why is cocaine, which stresses the cardiovascular system 'bad', while exercise, which also stresses the cardiovascular system, 'good'?
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Why do psychiatric medications take so long to become fully effective (six weeks), while many other medications work within minutes or hours?
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In massive stars, hydrogen fuses into helium, then carbon, neon, and oxygen before eventually fusing into iron. During the oxygen fusion phase, why doesn't all the oxygen simply ignite/catch fire?
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