Reading. Chemistshavebeenstudyingwhypeoplecry.Theysayt...
問題詳情：Reading.Chemistshavebeenstudyingwhypeoplecry.Theysaythebodyproducestwokindsoftears.Onekindcleansouttheeyeifitgetsdirtinit.Butwhenpeoplecrybecauseoftheirfeelings,thesetearshavepoisonouschemical...