Gwen Ifill talks with biographer Jeanne Theoharis, whose book "The Rebellious Life of Mrs. Rosa Parks" offers a complex portrait of the woman best known for refusing to give up her seat on an Alabama bus in 1955.

Wildebeest migrate across the African Serengeti plains in huge numbers in search of rain and fresh pastures. But their journey is fraught with danger. Biology - Ecosystems - Learning Points. African wildebeest annually migrate to stay in...

Gravity and erosion are major factors in changing the shape of the surface of Earth. The different types of erosion, and the major types of mass movements caused by gravity are discussed in this video. Other terminology includes:...

Baby Leatherback turtles (Dermochelys coriacea) crawlnig to the sea on sand, Papua New Guinea

Baby Leatherback turtles (Dermochelys coriacea) crawling to the sea on sand, Papua New Guinea

Baby Leatherback turtles (Dermochelys coriacea) crawling to the sea through sand, Papua New Guinea

1. Wide of David Puttnam at conference table

2. SOUNDBITE (English) David Puttnam, Film producer: (Followed by Spanish transla
tion)
"I have enormous faith in individuals and no faith at all in mass movements....

UK Prime Minister Theresa May Interview at the UN Summit on Refugees and Migrants

Rawalpindi

1. Zoom in group of protesters running towards road, throwing rocks UPSOUND: sho
uting
2. Men throwing stones in the street UPSOUND: chanting the name of former prime...

Rawalpindi

1. Zoom in group of opposition protesters running towards road, throwing rocks UPSOUND: sho
uting
2. Riot police charging across street towards protesters, tear...

Civil Rights activist Angela Davis holds a press conference about her organisation.

1. vs of Davis holding press confe
rence
2. SOUNDBITE (English): vs David speakin
g to press
Film: Pos - Sound: OPT SOF - Colour - NYFilm:...

While China's bloody crackdown on pro-democracy protests thirty years ago is being remembered around the world, residents of Beijing go about their normal lives as activists are silenced, discussions censored and memory of the massacre...

04/16/73 c0033725 - color

harlem: angela davis announces "national defense organizati
on."
nxc 47245 "davis" shows: angela and friends at enwsconference: black compantion: davis sof on national defense...