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Dinosaur-Killing Comet Didn't Wipe Out Freshwater Species

The cosmic impact that ended the age of dinosaurs killed many living creatures on land and in the sea, but scientists have found, puzzlingly, that life in freshwater largely escaped this fate. Full story

What Caused Ancient Upheaval to Australian Landscape?

Between about 45,000 and 50,000 years ago, Australia experienced three radical changes. The continent was once home to a menagerie of giant creatures, or megafauna, such as marsupial versions of lions, rhino-size wombats, giant kangaroos and flightless birds, but about 90 percent of that megafauna d Full story

On the Brink: Climate Change Endangers Common Species

A wide variety of plants and animals are likely to become much less common if something isn't done to avert the worst effects of a warming climate, new research suggests. Full story

Weird Dino Ancestors Boomed After Mass Extinction

Dinosaurs — or at least their ancestors — may have gotten an earlier start than once believed. Full story

Massive Extinction Fueled Rise of Crocodiles

A massive extinction between the Triassic and Jurassic eras paved the way for the rise of the crocodiles, new research suggests. Full story

Ancient Death Toll of Birds Confirmed in New Study

Human colonization caused the extinction of more than 1,000 bird species thousands of years ago on the Pacific Islands, scientists now say. Full story

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Mega Volcanoes May Have Killed Half of Earth's Species

Asteroid may have killed dinosaurs quicker than scientists thought

Chicxulub Asteroid Impact: The Dino-Killer That Scientists Laughed At

How to find and record all Earth's species

'T. Rex' of the Seas Called First Top Killer

Dino-Killing Meteorite Wiped Out Lizards, Too

Scientist argues volcanoes killed dinosaurs

Fossil Record Shows Species Need to Spread Out to Survive

Blue Iguana Slithers Back from Extinction

Bird extinction rate on the rise, study finds


  Obama's pressing speech on climate change

Chris Hayes talks to former Republican governor of New Jersey, Christine Todd Whitman, who was head of the Environmental Protection Agency under George W. Bush, and climate activist Tim DeChristopher, about the substantive nature of the president's climate change speech.

  Museum offers time, place for 'What the heck is this?'

Rachel Maddow reports on a regular event at the Museum of Natural History in New York City at which members of the public are invited to bring in mysterious objects they have collected for identification by the museum's scientists.