War in medieval times was about the control of land. Garrisons of knights and other soldiers who lived in castles controlled the land around their stone fortresses. To conquer a territory, an ...

The Secret Life of Scientists and Engineers is an Emmy-nominated web series and site from PBS’s NOVA. This is where you can learn about cutting-edge science and engineering, the amazing people who do ...

Major funding for "The Elegant Universe" is provided by the Alfred P. Sloan Foundation and the National Science Foundation, with additional funding from the Department of Energy and from Volkswagen of ...

How big is the universe? If it began with the Big Bang, will it also have an end? Is there life beyond our planet? Questions like these inspired the launch of Voyager I in 1977 and have driven ...

Zero and infinity. These seemingly opposite, obvious, and indispensable concepts are relatively recent human inventions. Discover the surprising story of how these key concepts that revolutionized ...

Explore the revolutionary engineering behind Paris’s iconic landmark. Completed in just over two years for the 1889 World’s Fair, the iron tower smashed the record for the tallest structure on Earth, ...

The epic 3 billion-year story of how our continent came to be. From the palm trees that once flourished in Alaska to titanic eruptions that nearly tore the Midwest in two, discover how forces of ...

Interphase is the period between cell divisions. During this time, chromosomes replicate—each DNA strand unzips into two strands while free-floating bases attach to the unzipped strands. The ...

As in prophase I, the chromosomes condense, spindles form, the centrioles begin to separate, and the nuclear membrane fragments and disperses. Unlike prophase I, the chromosomes do not attach to the ...

At the 1998 Winter Olympics in Nagano, Japan, snowboarding made its debut as an Olympic sport. No longer relegated to the fringes, snowboarders took to the snow-capped peaks of Mount Yakebitai, and 26 ...

We sent jellyfish into space—for science. Back in the 1990s, when we had the space shuttles available for ferrying stuff into orbit, we sent jellyfish into space. Then, it seemed almost comically ...

A sequel to one of the most popular NOVAs of all time, "Miracle of Life," this Emmy Award-winning program tracks human development from embryo to newborn using the extraordinary microimagery of ...