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The negro health problem is one of the “white man's burdens,” and it is by no means the least of those burdens. […] It is undoubtedly true that the negro race has deteriorated physically and morally since slavery times. In some ways, he is perhaps more intelligent, but freedom has not benefited his health, nor improved his morals. There is more sickness and inefficiency and crime among them now than before the war.– L.C. Allen (1914)

Rita Colwell, a Distinguished University Professor in the University of Maryland Institute for Advanced Computer Studies,

A new study shows that medium-sized predators all but disappeared late in dinosaur historywherever Tyrannosaurus rex and its close relatives rose to dominance. In those areas—lands that eventually became central Asia and Western North America—juvenile tyrannosaurs stepped in to fill the missing ecological niche previously held by other carnivores.