003930000a2200109000450024501480000065000210014865000160016965000260018504100130021110000230022477300360024710aEvolution by walkingsa stroll through the museum's new fossil mammal halls teaches the visitor that life's history is not linear but branching14aHistoria natural14aEvolución14aEducación ambiental0 aInglés1 aGould, Stephen Jay1 tNatural Historyq10-15d1995g3