Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems ．
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Prev: For instance, talking about mathematical geniuses who were more or less born that way puts students in a fixed mind-set, but descriptions of great mathematicians who fell in love with math and developed amazing skills produce a growth mind-set.
Next: According to Mark Saul, the director of competitions for the Mathematical Association of America, not a single African-American or Hispanic student---and only a handful of girls---has ever made it to the Math Olympiad team in its 50 years of existence.
