Energy Kids, maintained by the U.S. Energy Information Administration, host a range of resources for both educators and students. Students will enjoy the various educational activities and games available through the site, while educators will find the "for teachers" resources beneficial for classroom planning. Site includes an energy calculator.
The United States Patent and Trademark Office (USPTO) is the federal agency for granting U.S. patents and registering trademarks. This kids page specially designed for kids, parents and teachers. One can find "Cool IP", watch videos and work on fun activities.
"Explore earth and space. NASA Space Place's mission is to inspire and enrich upper-elementary-aged kids' learning of space and Earth science online through fun games, hands-on activities, informative articles and engaging short videos. With material in both English and Spanish and resources for parents and teachers, NASA Space Place has something for everyone." -- From NASA 's Space Place web page.
From the NIST kid's page, it teaches what is the International System of Units (SI), the modern metric system. What is the seven SI base units, their defining constants and how to use each unit. There are also coloring pages for fun.
National Oceanic and Atmospheric Administration (NOAA)
"Education resources are distributed across many websites and program offices at NOAA and on NOAA partner websites. This portal is designed to assist educators in accessing these materials from one centralized interface. The content here is a sampling of NOAA's education resources and more can be found at each linked location."
"Launched in 2002, NOAA SciJinks inspires and engages students to learn about weather, satellite meteorology and Earth science. Our fun articles, games and videos are targeted toward middle- and high-school aged students and their educators." -- From SciJinks website.