Sarah Holt

Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles. W...

29 de dez. de 2009

It's death on an unimaginable scale, when a majority of Earth's species quickly die out. It's called "mass extinction," and it's happened at least ...

30 de nov. de 2014

He went off to war an unknown soldier and returned a beloved national hero. Often dismissed as a "do-nothing" president and a good-natured bumbler,...

20 de set. de 1993

The enigmatic nature of the Nixon presidency combined comparatively progressive legislative initiatives with a flagrant abuse of presidential power...

15 de out. de 1990

Investigate how an asteroid vanquished the dinosaurs 66 million years ago. Join scientists as they drill into the impact crater and, for the first ...

27 de dez. de 2017

The rock pocket mouse is a living example of Darwin's process of natural selection. Evolution is happening right now everywhere around us, and adap...

12 de out. de 2011

NOVA investigates the story of cannabis from the criminalization that has disproportionately harmed communities of color to the latest medical unde...

21 de set. de 2021

The coronavirus SARS-CoV-2 has upended life as we know it in a matter of mere months. But at the same time, an unprecedented global effort to under...

13 de mai. de 2020

MacArthur is a 1999 television documentary film about Douglas MacArthur, a United States General of the Army. Produced by PBS for The American Expe...

17 de mai. de 1999

As the deadliest drug epidemic in US history rages, follow the cutting-edge work of doctors and scientists as they explore how ADDICTION affects th...

Scientists are coming to understand fat as a dynamic organ—one whose size may have more to do with biological processes than personal choices. Expl...

08 de abr. de 2020

The art of origami reshapes the world, affecting drug development and future NASA space missions.

15 de fev. de 2017

What will it mean when most of us can afford to have the information in our DNA - all three billion chemical letters of it - read, stored, and avai...

12 de mar. de 2012