Humans
Sibling rivalry: How birth order affects your personality and health
Flawed stereotypes abound about bossy firstborns, middle-child syndrome and only children, but the true influence of sibling sequence is much stranger
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Flawed stereotypes abound about bossy firstborns, middle-child syndrome and only children, but the true influence of sibling sequence is much stranger
Chlamydia may be able to spread through the gut after oral sex and go on to cause rectal infections, according to a study of heterosexual men