Dr. Stephen O'Brien of the National Cancer Institute discovers a 700-year-old mutation that makes a person resistant to HIV infection. From Evolution: "Evolutionary Arms Race."

This video segment from Kentucky Life explains the differences between dragonflies and damselflies and explores their habitats.

In this video adapted from ANDRILL, find out how geoscientists get through more than a dozen football fields of ice and water in order to study the rock and sediment beneath Antarctica.

Drums are more than just a collection of natural elements. The art and science of drum making have been part of Indigenous cultures throughout the world for millennia. Drums have a deep spiritual resonance, but also have a necessary understanding of physics, in order to achieve the correct sound.

This video segment from NOVA: "The Shape of Things" follows the growth of a duck embryo, from a single fertilized egg cell to a complex, hatching duckling.

This video segment from Weston Woods presents the story of Duke by Andrea Davis Pinkney, illustrated by Brian Pinkney, and is about Duke Ellington, one of the founding fathers of jazz. When Duke Ellington was young, his parents wanted him to learn to play the piano. Although he began lessons, he was soon lured away by his love of baseball. Later, as a teenager he heard the new musical style called "ragtime" and he was inspired once again to learn to play piano. Soon, he created his own style of music using "hops" and "slides" on the piano. He became a popular entertainer with a flair that attracted many fans.

In this video profile produced for Teachers' Domain, meet teacher Dustin Madden, an IŰ__ŒóíŠupiaq who hopes to inspire students to take an active role in protecting the natural environment by giving them a foundation in math and science.

In this Cyberchase video segment, the CyberSquad figures out how to earn 100 snelfus in 11 days.

This video segment adapted from NASA's Goddard Space Flight Center discusses how a drought can have negative effects locally, for example by increasing the number of forest fires, and also globally, for example by impacting air quality thousands of miles away.

This video segment adapted from NASA's Goddard Space Flight Center describes El Niño, how it forms, and the chain reaction of consequences it triggers around the globe.

This video segment adapted from NASA's Goddard Space Flight Center explains how hurricanes develop and why there are fewer hurricanes in the Atlantic Ocean in strong El Niño years.

This video segment adapted from NASA's Goddard Space Flight Center shows how integral satellites are to everyday life and describes the different types, including orbital and geostationary.

This interactive activity from the Adler Planetarium explains the reasons for the seasons. Featured is a game in which Earth must be properly placed in its orbit in order to send Max, the host, to different parts of the world during particular seasons.

This video segment adapted from NOVA tells the tragic story of two Japanese seismologists who disagreed about the threat of earthquakes in the early twentieth century. Today, seismologists in California offer residents a probability of risk that an earthquake might occur.

In this video segment adapted from NOVA, animations are used to show how the hills around Los Angeles were formed by earthquakes at small thrust faults that extend outward from the larger San Andreas fault.

The history of earthquakes in the San Francisco Bay area is plotted on a digital map and analyzed in this video segment adapted from NOVA.

In this video segment adapted from NOVA, a geologist digs a trench along the San Andreas Fault to reveal three thousand years of earthquake history. Information from the layers of sediment may help geologists to predict earthquakes.

This video segment adapted from NOVA uses historical illustrations, photographs, and animations to explain how seismographs work, the difference between P and S waves, and the Richter scale.

Learn about the different features of snow and ice in Antarctica using satellite imagery in this video segment adapted from NASA.

In this video produced for Teachers' Domain, Chi-An Wang, a mechanical engineering graduate from the Massachusetts Institute of Technology, describes her process when working with New Balance to design a new triathlon shoe.