This video segment adapted from NOVA shows how Galileo, using his newly developed refracting telescope, observed four of Jupiter's moons, the first astronomical bodies to be discovered since ancient times.

This video segment adapted from NOVA shows how Galileo used his telescope to carefully observe and study sunspots.

This brief video segment produced for Teachers' Domain features time-lapse video of a sunrise and a sunset. [1:06]

In this adapted video segment, ZOOM guest Tommy takes us on a tour of the Florida Everglades. He describes what makes a wetland biome unique, including the soil, precipitation, and biodiversity. [2:53]

ZOOM guest Amy wants to be a meteorologist and volunteers at a weather observatory. In this adapted video segment, she shows us instruments used to predict the weather and describes how air pressure affects weather patterns. [1:27]

This video segment adapted from NOVA uses microwave images to reveal how sea ice doubles the size of Antarctica each winter. Rare footage shows how sea ice crushed the famous ship Endurance in 1914. [2:34]

In this video segment produced for Teachers' Domain, observe frozen water in winter and liquid water in summer, at the same location. [0:31]

Learn about root systems of trees in the Congaree Swamp National Park in this video segment from NatureScene. [2:50]

In this oral history from the Birmingham Civil Rights Institute, Audrey Hendricks recalls her arrest and jailing at the age of nine for participation in the Children's Crusade of 1963. [6:00]

Melba Patillo Beals was one of nine black students who desegregated Little Rock's Central High School in 1957. In this interview, recorded for Eyes on the Prize, Beals describes her tumultuous experience. [5:58]

In this oral history from the Birmingham Civil Rights Institute, Washington Booker recalls being arrested and jailed for participating in the Children's Crusade of 1963. [6:17]

This excerpt from WGBH's Evening Compass news program summarizes events of the first year of the 1974 Boston school desegregation plan. [3:33]

In this oral history from the Birmingham Civil Rights Institute, Joe Dickson recalls student activism at Miles College. [6:50]

In this video interview, recorded for Eyes on the Prize, Freedom Ride organizer James Farmer describes the interracial bus rides through the South that tested desegregation and sparked white resistance. [6:45]

Point/counterpoint commentary on the president's actions after the Brown ruling; from American Experience: "Eisenhower." [6:32]

In this oral history from the Birmingham Civil Rights Institute, Lola Hendricks describes her work behind the scenes to advance the Civil Rights movement. [4:21]

In this oral history from the Birmingham Civil Rights Institute, Miriam McClendon recalls her arrest and jailing for participation in the Children's Crusade of 1963. [6:22]

In this video segment, recorded for Eyes on the Prize, activist Robert Moses talks about the Mississippi voting rights campaign. [4:00]

This audio compilation, recorded live at the 1963 March on Washington, captures the voices of several civil rights leaders.

This audio compilation, recorded live at the 1963 March on Washington, pays tribute to the women -- both leaders and widows of slain leaders -- of the Civil Rights movement.

In this video [3:54] adapted from the Arctic Athabaskan Council, learn how warmer temperatures in the Arctic are transforming the landscape, triggering a host of effects such as permafrost thawing and insect infestations.

In this video from Common Ground and Cleaner Water, Tribby Vice, a Kentucky farmer, talks about the changes he has made on his farm to protect the water quality of the stream running through his property and the watershed in which he...

This video segment from the Nevada Department of Wildlife looks at various species of bats and how they impact the environment. [3:14]

In this video segment adapted from NOVA scienceNOW, microbiologist Bonnie Bassler shares her discovery that bacteria coordinate group activity by communicating through chemical signals. [4:49]