Science 2018-02-16.pdf

712 16 FEBRUARY 2018 VOL 359 ISSUE 6377sciencemag.org SCIENCE16 FEBRUARY 2018 VOLUME 359 ISSUE 6377CONTENTS724Watching a neutron star collapsePHOTO:SEAN BAGSHAW/GETTY IMAGES;GRAPHIC:C.BICKEL/SCIENCENEWSIN BRIEF720 News at a glanceIN DEPTH 723 SCIENCE GETS MODEST REPRIEVE IN TRUMP BUDGET Late changes leave major agencies flat,but 2019 request still cuts many research programs By Science News Staff724 A WEIGHT LIMIT EMERGES FOR NEUTRON STARSMerger reveals mass at which the cosmoss densest objects collapse into black holes By A.Cho725 ARTIFICIAL INTELLIGENCE FACES REPRODUCIBILITY CRISISUnpublished code and sensitivity to training conditions make many claims hard to verify By M.Hutson726 U.K.MOMS ARE TURNING PARENTING INTO AN EXPERIMENTUnusual collaboration studies human milk,baby temperature,and schooling By T.Rabesandratana728 CAMERA RECORDS CELL ACTION WITH NEW CRISPR TRICKSThe powerful genome editor shows off its versatility again By J.Cohen729 ISOTOPE CLOUD LINKED TO FAILED NEUTRINO SOURCEMishandling of spent fuel in Russia may have caused radioactivity to spread across Europe By E.CartlidgeFEATURES 730 THE DATA THUGSNick Brown and James Heathers have had striking success in catalyzing retractions by publicly calling out questionable data By A.Marcus and I.Oransky733 THE CARBON HARVESTVast bioenergy plantations could suck up carbon and stave off climate change.They would also radically reshape the planet By J.RosenINSIGHTSPERSPECTIVES 738 IS EVOLUTION PREDICTABLE?Simple traits may not have simple,predictable evolutionary paths By D.Reznick and J.Travis REPORT P.765740 CONTROLLING LEARNING AND EPILEPSY TOGETHERSilencing dentate gyrus mossy cells affects spatial learning as well as seizures By H.E.Scharfman REPORT P.787741 THE VALUE OF POLLINATORSPECIES DIVERSITYMost crop-visiting species are needed to ensure high levels of crop pollination By C.Kremen REPORT P.791743 CAPSULES MADE FROM PREFABRICATED THIN FILMSDroplets become encapsulated after falling into floating polymer films By E.Amstad REPORT P.775744 THE CHANGING FACE OF URBAN AIR POLLUTIONVolatile organic compounds in U.S.urban air increasingly derive from consumer products By A.C.Lewis REPORT P.760745 CHROMATIN REGULATION AND IMMUNE ESCAPEDeficiency in a chromatin remodeling complex enhances tumor immunotherapy By E.Ghorani and S.A.Quezada RESEARCH ARTICLE P.770;REPORT P.801 POLICY FORUM 747 WAS THERE EVER REALLY A“SUGAR CONSPIRACY”?Twists and turns in science and policy are not necessarily products of malevolence By D.M.Johns and G.M.Oppenheimer PODCASTBOOKS ET AL.751 ELECTRICAL CHAOSA candid portrait of the scientists studying Earths declining magnetism warns of potential peril if the poles swap places By B.Buffett752 LOOK TO THE LOCALSA field scientist reflects on how indigenous knowledge can enhance tropical forest management By J.L.ReidLETTERS 754 SALTON SEA:ECOSYSTEM IN TRANSITIONBy T.J.Bradley and G.M.Yanega754 FUND THE BIOLOGICAL SURVEY UNITBy R.S.Sikes et al.7Ws733DA_0216TOC.indd 7122/14/18 11:07 AMPublished by AAASon February 15,2018 http:/science.sciencemag.org/Downloaded from 16 FEBRUARY 2018 VOL 359 ISSUE 6377 713SCIENCE sciencemag.org794Activating an immune responsePHOTO:BETTMANN/GETTY IMAGES;GRAPHIC(FROM LEFT TO RIGHT):C.BICKEL/SCIENCE;UGURLAR ET AL.DEPARTMENTS719 EDITORIAL Exploration before exploitationBy Erik E.Cordes and Lisa A.Levin838 WORKING LIFEGot milk,must conferenceBy Rebecca M.CalisiRESEARCHIN BRIEF 756 From Science and other journalsREVIEW759 ORGANIC CHEMISTRYEnantioselective C(sp3)H bond activation by chiral transition metal catalysts T.G.Saint-Denis et al.REVIEW SUMMARY;FOR FULL TEXT:dx.doi.org/10.1126/science.aao4798RESEARCH ARTICLES 760 ATMOSPHERIC CHEMISTRYVolatile chemical products emerging as largest petrochemical source of urban organic emissions B.C.McDonald et al.PERSPECTIVE P.744765 EVOLUTIONARY ECOLOGYNatural selection and the predictability of evolution in Timema stick insects P.Nosil et al.PERSPECTIVE P.738770 CANCERA major chromatin regulator determines resistance of tumor cells to T cellmediated killing D.Pan et al.PERSPECTIVE P.745;REPORT P.801REPORTS 775 APPLIED PHYSICSWrapping with a splash:High-speed encapsulation with ultrathin sheets D.Kumar et al.PERSPECTIVE P.743;VIDEO779 PEPTIDE MODIFICATIONNatural noncanonical protein splicing yields products with diverse-amino acid residues B.I.Morinaka et al.783 QUANTUM OPTICSObservation of three-photon bound states in a quantum nonlinear medium Q.-Y.Liang et al.787 NEUROSCIENCEDentate gyrus mossy cells control spontaneous convulsive seizures and spatial memory A.D.Bui et al.PERSPECTIVE P.740791 ECOSYSTEM SERVICESSpecies turnover promotes the importance of bee diversity for crop pollination at regional scales R.Winfree et al.PERSPECTIVE P.741794 STRUCTURAL IMMUNOLOGYStructures of C1-IgG1 provide insights into how danger pattern recognition activates complement D.Ugurlar et al.798 BIOCHEMISTRYLipopolysaccharide is transported to the cell surface by a membrane-to