Pbs: Nova Science Now: Leeches

If the word alchemy makes you think of wizards gathered around bubbling cauldrons, you're not completely wrong! Introduce scholars to the history of chemistry during part 10 of a 15-part History of Science series. The video takes viewers...

Watch this video to learn PBS NOVA: how scientists calculate the probability of intelligent life forms on other planets. Listen to experts' opinions on this topic and learn what scientists are doing to search for extraterrestrials. [51:58]

A video narrated by Neil deGrasse Tyson that explores what caused the Permian extinction, the mother of all extinctions, 250 million years ago? [13:14]

A scientific inquiry into what causes obesity. Includes research surrounding a chemical in the brain proven to regulate body weight. [12:20]

Students practice a procedural skill -- knot tying -- to investigate if and in what way sleep affects learning and memory in relation to a learning a procedural skill. Sleeping is a behavior that is natural and essential for our health...

This video examines the threat of a virus being spread from birds to humans, and then from humans to humans. It details the mechanisms viruses use to infect cells, and explores how mutations in a virus may change its virulence and how it...

The first in a four-part PBS series, hour-long video defines "strength" of materials, with examples ranging from steel cables to mollusk shells. Insight from research and experts offers a look into the process of "re-engineering"...

Nova offers an enlightening conversation with astrophysicist Neil deGrasse Tyson. Topics include origins of the universe, multidisciplinary approaches to science, exciting recent discoveries, his position as director of the Hayden...

Scientists can still be surprised! The genetic ingredients that assemble us are similar to those that assemble a fly. NOVA explains the emerging science of evolution developmental biology. This is the science that studies genes at the...

This documentary film [02:00:00] examines Darwin's insights and discusses how new breakthroughs in science are unlocking answers to riddles that Darwin couldn't answer. (29 December 2009)