IMAGES:(TOPTOBOTTOM)N.DESAI/SCIENCE,SARAHKOENIGSBERG,COURTESYOFTHEBEAVERBELIEVERS;LUSH/123RF8JUNE2018•VOL360ISSUE63931045SCIENCEsciencemag.org8JUNE2018•VOLUME360•ISSUE6393CONTENTS1075RethinkingmodelsofembryogenesisINSIGHTSBOOKSETAL.1062SUMMERREADING,SCIENCESTYLE▶PODCASTPERSPECTIVES1068ORGANICMOLECULESONMARSDatafromtheCuriosityroverprovideevidencefororganicmoleculesinancientmartianrocksandintheatmosphereByI.L.tenKate▶NEWSSTORYP.1054;REPORTSPP.1093&10961069HONEYBEESZEROINONTHEEMPTYSETHoneybeesjoinaselectnumberofanimalsshowntounderstandtheconceptofnothingByA.Nieder▶REPORTP.11241070TARGETINGMICROBIALPATHOGENSPlantssecreteextracellularvesiclestopreventfungalinfectionByB.P.H.J.ThommaandD.E.Cook▶REPORTP.11261072WHATPRECIPITATIONISEXTREME?HowextremeprecipitationisdefinedaffectstheconclusionsdrawnaboutthewayitchangeswithwarmingByA.G.Pendergrass1073THEEXPANDINGMATERIALSMULTIVERSEHeatcapacityandRamanexperimentspointtofractionalizedexcitationsinadipoleliquidByB.J.Powell▶REPORTP.11011075EXPLORINGEARLYHUMANEMBRYODEVELOPMENTStemcell–derivedmodelsenableunderstandingofhumanembryogenesisByJ.RossantandP.P.L.Tam1077STANLEYFALKOW(1934–2018)FounderofmolecularpathogenesiswhodiscoveredhowantibioticresistancespreadsByD.MonackandE.StraussPOLICYFORUM1078GENEALOGYDATABASESANDTHEFUTUREOFCRIMINALINVESTIGATIONThepolicecanaccessyouronlinefamily-treeresearch—anduseittoinvestigateyourrelativesByN.Rametal.1056DIGSEEKSSITEOFFIRSTENGLISHSETTLEMENTINTHENEWWORLDResearchersrestarttheirquestfortheLostColonists’townByA.Lawler1057MIDDLEWEIGHTBLACKHOLESFOUNDATLASTDiscoverycouldexplaintheoriginofmillion-solar-massmonstersatgalacticcentersByD.Clery▶PODCASTFEATURE1058BEAVERS,REBOOTEDArtificialbeaverdamsareahotrestorationstrategy,buttheprojectsaren’talwayswelcomeByB.Goldfarb▶VIDEONEWSINBRIEF1050NewsataglanceINDEPTH1052SHESTUDIEDMEXICOCITY.CANSHELEADIT,TOO?EnvironmentalengineerClaudiaSheinbaumPardomaybecomethemegacity’snextmayorByL.Wade1053CHINATAKESNEWSTEPSTOLURESCIENCETALENTFROMABROADGenerousf...
