Science 2016-01-22.pdf

336 INTERLACING MOLECULAR THREADSMaterials with a fabric-like microstructure are highly elasticBy E.Gutierrez-Puebla REPORT P.365337 EDITING POLICY TO FIT THE GENOME?Framing genome editing policy requires setting thresholds of acceptability By R.Isasi et al.340 HOW CHERENKOV RADIATIVE LOSSES CAN IMPROVE OPTICAL FREQUENCY COMBSBroader optical frequency combs on a photonic chip can help refine time standards By N.Akhmediev and N.Devine REPORT P.357341 OLIGODENDROCYTES FOLLOW BLOODVESSEL TRAILS IN THE BRAINBrain microvasculature is a scaffold for neuroglial migration By E.Dejana and C.Betsholtz REPORT P.379342 THE DO-IT-ALL NITRIFIERThe discovery of bacteria that can oxidize both ammonia and nitrite upends a long-held dogma By A.E.Santoro344 KNOWLEDGE CAPITAL,GROWTH,AND THE EAST ASIAN MIRACLEAccess to schools achieves only so much if quality is poor By E.A.Hanushek and L.WoessmannBOOKS ET AL.346 THE CABARET OF PLANTSBy R.Mabey,reviewed by H.A.Curry347 TRAUMAReviewed by G.FrazzettoLETTERS 348 EDITORIAL EXPRESSION OF CONCERNBy M.McNutt348 ERADICATING POLIO:A BALANCING ACTBy V.Agol et al.348 PRACTICALITIES OF POLITICAL AGENCYBy I.Kelman349 RESPONSEBy K.OBrien316 22 JANUARY 2016 VOL 351 ISSUE 6271sciencemag.org SCIENCE22 JANUARY 2016 VOLUME 351 ISSUE 6271CONTENTS330The solar system gains a planetNEWSIN BRIEF320 News at a glanceIN DEPTH 323 SHELL TRADE PUSHES GIANTCLAMS TO THE BRINKWith elephant tusks harder to obtain,the“jade of the sea”is the new ivory in China By C.Larson324 DEBATE SHARPENS OVER U.K.THREAT TO LEAVE EUROPEMany researchers worry about a loss of funds and influence,but some say the fears are overblown By E.Stokstad and T.Rabesandratana325 BIDEN SEEKS CLEAR COURSE FOR HIS CANCER MOONSHOTResearchers have plenty of ideas for the vice presidents bid to boost collaboration and improve treatments By J.Kaiser and J.Couzin-Frankel326 STANDOFF IMPERILS OREGON REFUGETakeover disrupts what observers call a model public-private restoration effort By R.F.Service328 DATA CHECK:TRACKING FIRST JOBS TO MEASURE THE IMPACT OF RESEARCH FUNDINGStudy of recent Ph.D.s at eight Midwestern universities demonstrates value of the new science of science policy By J.Mervis329 MONTREAL INSTITUTE GOING OPENTO ACCELERATE SCIENCEExperiment aims to show whether forgoing patents and freeing up data can boost neuroscience research By B.OwensFEATURE 330 NUMBER 9A new giant planet,still unseen,appears to be shaping the orbits of objects beyond Neptune By E.Hand PODCASTINSIGHTSPERSPECTIVES 334 PLASMONICSTURNING LOSS INTO GAINThe optical losses usually associated with plasmonic materials could be used in applications By J.C.Ndukaife et al.329Published by AAAS22 JANUARY 2016 VOL 351 ISSUE 6271 317SCIENCE sciencemag.org341&379Neuroglia follow vascular paths334Plasmonics applications heat upScience Staff.318New Products.412Science Careers.414ON THE COVERIllustration of woven molecular fabric.Interlacing threads to create woven patterns is among the oldest methods of making fabric,but until now,this technique has not been duplicated in complex chemical structures.Liu et al.used threads made from organic molecules linked together by strong covalent bonds to weave a three-dimensional covalent organic framework with unusual dynamical and mechanical properties.This molecular weaving method will enable the production of materials with increased precision and functionality.See pages 336 and 365.Illustration:C.Bickel/ScienceSCIENCE(ISSN 0036-8075)is published weekly on Friday,except the last week in December,by the American Association for the Advancement of Science,1200 New York Avenue,NW,Washington,DC 20005.Periodicals mail postage(publication No.484460)paid at Washington,DC,and additional mailing offices.Copyright 2016 by the American Association for the Advancement of Science.The title SCIENCE is a registered trademark of the AAAS.Domestic individual membership and subscription(51 issues):$165($74 allocated to subscription).Domestic institutional subscription(51 issues):$1522;Foreign postage extra:Mexico,Caribbean(surface mail)$55;other countries(air assist delivery)$89.First class,airmail,student,and emeritus rates on request.Canadian rates with GST available upon request,GST#1254 88122.Publications Mail Agreement Number 1069624.Printed in the U.S.A.Change of address:Allow 4 weeks,giving old and new addresses and 8-digit account number.Postmaster:Send change of address to AAAS,P.O.Box 96178,Washington,DC 200906178.Single-copy sales:$15.00 current issue,$20.00 back issue prepaid includes surface postage;bulk rates on request.Authorization to photocopy material for internal or personal use under circumstances not falling within the fair use provisions of the Copyright Act is granted by AAAS to libraries and other users registered with the Copyright Clearance Center(CCC)Transactional Reporting Service,provided that$35.00 per article is paid directly to CCC,222 Rosewood Drive,Danvers,MA 01923.The identification code for Science is 0036-8075.Scienc