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31st Annual U.S. Symposium 31st Annual U.S. Symposium
A New Editorial by Marcia McNutt - Science and Equality of Opportunity A New Editorial by Marcia McNutt - Science and Equality of Opportunity
NAS President Marcia McNutt’s Statement on Diversity, Equity, and Inclusion NAS President Marcia McNutt’s Statement on Diversity, Equity, and Inclusion
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The National Academy of Sciences (NAS) is a private, nonprofit organization of the country’s leading researchers. The NAS recognizes and promotes outstanding science through election to membership; publication in its journal, PNAS; and its awards, programs, and special activities. Through the National Academies of Sciences, Engineering, and Medicine, the NAS provides objective, science-based advice on critical issues affecting the nation. Read More»

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Election to membership in the NAS is considered one of the highest honors that a scientist can receive. Read more about our members and their contributions to science.

Featured member: In The New York Times, Orley Ashenfelter discusses how economic inequality has caused the prices of high-end wines to increase.

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Access information about current and recently completed studies of the National Academies of Sciences, Engineering, and Medicine, including over 5,000 publications available free online. Read More »

A new report details how business structures, employment relationships, job characteristics, and worker outcomes have changed in the United States over the last few decades—in some ways unpredictably.

Proceedings of the National Academy of Sciences (PNAS)

PNAS is one of the world’s most-cited and comprehensive multidisciplinary scientific journals, publishing more than 3,200 research papers annually. The journal’s content spans the biological, physical, and social sciences and is global in scope.

DDoS protection by Cloudflare
Ray ID: 5f8c9bba5b6aec92
java.lang.RuntimeException: Failed to parse RSS feed: xml= Just a moment...
DDoS protection by Cloudflare
Ray ID: 5f8c9bba5b6aec92
at com.frontleaf.content.template.RssFeedRenderer.render(RssFeedRenderer.java:83) at _jsp._templates._default_22dhost._system._pagelets._rss__jsp._jspService(_rss__jsp.java:183) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:578) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.include(NamedDispatcherImpl.java:87) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:92) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:504) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368) at com.frontleaf.template.TemplateInclude.write(TemplateInclude.java:86) at com.frontleaf.template.TemplateBody.writeBody(TemplateBody.java:60) at com.frontleaf.template.TemplateBody.write(TemplateBody.java:50) at com.frontleaf.template.Template.write(Template.java:102) at com.frontleaf.content.template.ItemTemplate.write(ItemTemplate.java:772) at _jsp._templates._default_22dhost._system._pagelets._body__jsp._jspService(_body__jsp.java:124) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:578) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.include(NamedDispatcherImpl.java:87) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:92) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:504) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368) at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:1009) at _jsp._templates._default_22dhost._system._index__jsp._jspService(_index__jsp.java:205) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:587) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.forward(NamedDispatcherImpl.java:108) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:56) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:293) at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111) at com.frontleaf.server.ResourceFilter.doFilter(ResourceFilter.java:220) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.server.RequestParameterFilter.doFilter(RequestParameterFilter.java:106) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.security.UserFilter.handleRequest(UserFilter.java:75) at com.frontleaf.sql.DatabaseFilter.doFilter(DatabaseFilter.java:96) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.server.IPFilter.doFilter(IPFilter.java:212) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273) at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682) at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:730) at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:649) at java.lang.Thread.run(Thread.java:682) Caused by: org.xml.sax.SAXParseException: The element type "meta" must be terminated by the matching end-tag "". at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:247) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284) at com.frontleaf.util.DOMTools.parseDocument(DOMTools.java:591) at com.frontleaf.util.DOMTools.parseDocument(DOMTools.java:598) at com.frontleaf.content.template.RssFeedRenderer.render(RssFeedRenderer.java:81) ... 61 more --> RSS Feed unavailable
DDoS protection by Cloudflare
Ray ID: 5f8c9bbadb9deccf
java.lang.RuntimeException: Failed to parse RSS feed: xml= Just a moment...
DDoS protection by Cloudflare
Ray ID: 5f8c9bbadb9deccf
at com.frontleaf.content.template.RssFeedRenderer.render(RssFeedRenderer.java:83) at _jsp._templates._default_22dhost._system._pagelets._rss__jsp._jspService(_rss__jsp.java:183) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:578) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.include(NamedDispatcherImpl.java:87) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:92) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:504) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368) at com.frontleaf.template.TemplateInclude.write(TemplateInclude.java:86) at com.frontleaf.template.TemplateBody.writeBody(TemplateBody.java:60) at com.frontleaf.template.TemplateBody.write(TemplateBody.java:50) at com.frontleaf.template.Template.write(Template.java:102) at com.frontleaf.content.template.ItemTemplate.write(ItemTemplate.java:772) at _jsp._templates._default_22dhost._system._pagelets._body__jsp._jspService(_body__jsp.java:124) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:578) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.include(NamedDispatcherImpl.java:87) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:92) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:504) at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368) at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:1009) at _jsp._templates._default_22dhost._system._index__jsp._jspService(_index__jsp.java:205) at com.caucho.jsp.JavaPage.service(JavaPage.java:61) at com.caucho.jsp.Page.pageservice(Page.java:587) at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195) at com.caucho.server.webapp.NamedDispatcherImpl.forward(NamedDispatcherImpl.java:108) at com.frontleaf.server.JSPDispatcher.doGet(JSPDispatcher.java:56) at javax.servlet.http.HttpServlet.service(HttpServlet.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103) at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:97) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:293) at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111) at com.frontleaf.server.ResourceFilter.doFilter(ResourceFilter.java:220) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.server.RequestParameterFilter.doFilter(RequestParameterFilter.java:106) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.security.UserFilter.handleRequest(UserFilter.java:75) at com.frontleaf.sql.DatabaseFilter.doFilter(DatabaseFilter.java:96) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.frontleaf.server.IPFilter.doFilter(IPFilter.java:212) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87) at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265) at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273) at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682) at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:730) at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:649) at java.lang.Thread.run(Thread.java:682) Caused by: org.xml.sax.SAXParseException: The element type "meta" must be terminated by the matching end-tag "". at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:247) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284) at com.frontleaf.util.DOMTools.parseDocument(DOMTools.java:591) at com.frontleaf.util.DOMTools.parseDocument(DOMTools.java:598) at com.frontleaf.content.template.RssFeedRenderer.render(RssFeedRenderer.java:81) ... 61 more --> RSS Feed unavailable

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