This illustrated essay from the NOVA Web site explains why the atomic structure of a diamond slows down light and produces a sparkle more brilliant than from any other colorless substance.

This animated essay from the NOVA Web site examines the design of Galileo's refracting telescope and Sir Isaac Newton's reflecting telescope.

This illustrated essay from the NOVA Web site introduces the basic concepts of Einstein's General Theory of Relativity and what we know about cosmology as a result.

This illustrated essay from the NOVA Web site answers questions about irregularities in the tides.

How does an airplane stay aloft when upside down? This media-rich essay from the NOVA Web site offers an explanation based on Newton's third law of motion.

Discover the difference between free-falling and weightlessness in this interactive activity from the NOVA: "Stationed in the Stars" Web site.

This media-rich series of interviews from the NOVA: "Stationed in the Stars" Web site explores the unique challenges faced by astronauts doing construction work in outer space.

Did you know that air has weight? This illustrated essay from the NOVA Web site explores conditions that affect air density and atmospheric pressure.

This essay from the NOVA Web site explores the impact Einstein made on physics and most everything we know about the cosmos.

Meet chemistry professor Dr. John Conkling in this interview from the NOVA Web site and learn why fireworks are his passion.

In this media-rich essay from the NOVA Web site, astronomer Brent Tully of the University of Hawaii walks you through the latest scientific theories about the size of the universe.

This article explains what adjectives do, the questions they answer, and provides examples. It also provides a list of links to websites where adjective lesson plans, worksheets, and activities can be found.

Even great scientists make mistakes! This illustrated essay from the NOVA Web site looks at Galileo's theory of the tides, which, while well thought out, was wrong.

Einstein called Galileo the "father of modern physics." This media-rich essay from the NOVA Web site looks at Galileo's quest to understand the mathematics of motion.

This article gets down to the basics, including what podcasts are, how to access them, how to create them, and why to use them. While it is specifically directed toward school librarians, the information is equally applicable for...

This article goes over some key points to help teachers explain to students why they should be cautious about using websites found through search engines to conduct academic research.

This article discusses games for learning grammar usage including classroom games like Invisible Grammar Guy, Rhyme That Word; how teachers can make their own games using online word search and puzzle makers; and online grammar game...