https://science.sciencemag.org/content/371/6525/145 Skip to main content ScienceMag.org Search X [ ] Advanced Search * Contents * News * Careers * Journals Read our COVID-19 research and news. Page Not Found The requested page "content/371/6525/145" could not be found. Please check the address for the page you were trying to reach. If you believe you have reached this page in error, you may contact us with any questions. More From Science * Current Table of Contents * First Release Science Papers * Archive * Collections * Book and Media Reviews * About Science + Mission and Scope + Editors and Advisory Boards + Editorial Policies + Information for Authors + Information for Reviewers + Staff + Contact Us * Remote Access for Current Subscribers * Editor's Blog * Custom Publishing * Awards * Order a Single Issue * Get the Science eTOC Alert * Submit Read the Latest Issue of Science 8 January 2021 Vol 371, Issue 6525 Magazine Cover Table of Contents * Feature The hole truth * Science for Policy: COVID-19 Coevolution of policy and science during the pandemic * Psychology Play breeds better thinkers * SCI COMMUN News at a glance * Coronavirus SARS-CoV-2 spillover events * Working Life Breaking through language barriers * About Us + Journals + News from Science + Leadership + Team Members + Work at AAAS * For Advertisers + Advertising Kits + Awards and Prizes + Custom Publishing + Webinars * For Authors + Submit + Information for Authors + Editorial Policies * For Librarians + Manage Your Institutional Subscription + Information for Librarians + Request a Quote + FAQs * Related Sites + AAAS.org + EurekAlert! + Science in the Classroom + Science Magazine Japanese * Help + Access and Subscriptions + Order a Single Issue + Reprints and Permissions + Contact Us + Accessibility * Stay Connected + Facebook + Twitter + Instagram + YouTube + RSS Feeds + WeChat Science/AAAS (c) 2021 American Association for the Advancement of Science. All rights reserved. AAAS is a partner of HINARI, AGORA, OARE, CHORUS, CLOCKSS, CrossRef and COUNTER. Science ISSN 1095-9203. * Terms of Service * Privacy Policy * Contact AAAS