June2022SCIENTIFICAMERICAN.COMTheScienceofChildCareMysteriousCosmicExplosionsHowtheBrainBuildsRealityAGEAGEOFTHEOFTHEMAMMALSMAMMALSAfterthedinosaursdied,Afterthedinosaursdied,ourancestorsthrivedourancestorsthrived©2022ScientificAmericanJune2022,ScientificAmerican.com1June2022VOLUME326,NUMBER6SteveBrusatteONTHECOVERCimolestes,thesizeofasmallrodent,livedalongsidedinosaursduringtheCretaceousepoch.Itbelongedtoagroupofmammalsknownastheeutherians,whichgaverisetotheplacentals.Placentalmammalsgivebirthtolive,well-developedyoung.Theyconstitutethelargestgroupofmammalsalivetodayandincludecreaturesasdisparateasbats,whalesandhumans.IllustrationbyBethZaiken.28PA...
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