Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS.
A lock
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or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
Welcome to the Help Center. We offer some helpful features to allow you to find what you want easily and quickly.
Download plug-ins and viewers for special file formats used on this site.
View a map of the NSF site.
Find contact information for people and organizations at NSF.
