简介：Lastyearthediscoveryofatinyfossilisedjawbonehittheheadlines.Thejawbone,onlyafewcentimetreslong,andwith7rowsofteeth,hadbeenfoundlyingabandonedinadustymuseumwhereithadlainunnoticedfordecades.It'srediscoveryhascausedasensationintheworldofpalaeontologybecausescientistsnowbelieveitmaybeatinyremnantofa"missinglink",anancientextinctanimalthatcouldprovideavitalclueinourunderstandingofoneofthegreatmysteriesofscience-how,360millionyearsago,aslimyfish-likecreaturegrewlegsandwalkedoutofthesea,ontotheland,andbecameourancestor.Thismystery,ofhowandwhy,longago,wegrewlegsandcrawledoutofthewater,hastakenscientistsacenturytounravel.Andthistinyjawbonemaybeafinalclue.…