22 September 2011, 12:00 PM ET
The Denisovans spanned from Siberia to Asia, leaving evidence of interbreeding in modern humans.
14 September 2011, 10:44 AM ET
A rare hybridization event between the Eastern tiger swallowtail and the Canadian tiger swallowtail gave rise to the ancestor that started the Appalachian tiger swallowtail lineage.
13 September 2011, 07:01 PM ET
People with close ties to mom and dad are more likely to have kids of their own.
12 September 2011, 03:00 PM ET
Insect viruses first evolved around 310 million years ago — among the oldest age estimate for any virus group — and may have played a role in the diversification of their insect hosts.
05 September 2011, 03:32 PM ET
Seems as if modern humans were interbreeding with various similar species around at the time.
22 August 2011, 01:49 PM ET
What separates humans from other animals? Some of the answers might surprise you.
16 August 2011, 07:01 PM ET
Ancient baleen whales first evolved their huge mouths for sucking individual prey.
05 August 2011, 02:39 PM ET
Musical improvisation can improve depression.
03 August 2011, 01:01 PM ET
Our ancestors preferred shrubs, it seems.
02 August 2011, 07:01 PM ET
A marvel of evolution, the crested rat chews poisonous tree bark and applies its spit to specially modified hairs to make its coat poisonous and deter predators from gulping it down.
25 July 2011, 03:00 PM ET
The human brain shrinks with age, unlike that of our closest living relative, the chimpanzee.
19 July 2011, 05:53 PM ET
Sloths move like monkeys, but with energy-saving adaptations.
18 July 2011, 01:27 PM ET
The twelve-fingered Iberian mole grows a special set of extra thumbs, used to improve their tunneling abilities, from a repurposed wristbone.
29 June 2011, 01:44 PM ET
The predatory owner of these eyes lived half a billion years ago.
16 June 2011, 11:35 AM ET
We each possess 60 new mutations, any of which could make major changes in our appearance or behavior. The genetic mistakes are the driving force of evolution.
10 June 2011, 05:35 PM ET
Richard Lenski's two decade experiment on E. coli sheds new light on evolutionary processes.
08 June 2011, 01:16 PM ET
Don't feel silly if you won't walk under a ladder or you carry a lucky charm.
07 June 2011, 07:01 PM ET
War makes people willing to punish those who don't work well with others.
03 June 2011, 10:01 AM ET
From his wandering eye to his real desire to mate for life, here are the top 10 things every woman should know about the male brain.
02 June 2011, 07:20 AM ET
Two completely independent animals have evolved the same body part independently.
20 May 2011, 01:44 PM ET
Cynthia Beall studies how Tibetans survive the low oxygen of high altitudes
19 May 2011, 12:28 PM ET
The Great Southern Brood of cicadas is emerging after 13 years. It's no mere coincidence that cicadas have life cycles that are prime numbers.
11 May 2011, 01:48 PM ET
Why some places have more species than others.
09 May 2011, 03:01 PM ET
The remains of a Neanderthal infant shed light on their extinction.
08 May 2011, 01:01 PM ET
A treasure trove of ancient marsupial skeletons indicates they lived in large groups, unlike today's pouched animals.
03 May 2011, 04:46 PM ET
Even forensic detectives would have a hard time distinguishing between koala fingerprints and human ones.
02 May 2011, 03:01 PM ET
The strong-jawed human relative was long throught to prefer nuts.
28 April 2011, 01:06 PM ET
Certain pupfish evolved specialized jaws very rapidly.
27 April 2011, 02:23 AM ET
Alien life may be able to exploit more-extreme environments than thought, because huge gravitational forces don't seem to pose microbes many problems.
18 April 2011, 05:57 PM ET
Georgia O’Keeffe’s paintings look more sexual to fertile women than to non-fertile ones.
13 April 2011, 02:25 PM ET
An ancient mammal-like fossil helps to settle the debate over when mammals started hearing loud and clear.
12 April 2011, 07:01 PM ET
The antibacterial compounds in sperm may decrease the likelihood of sexually transmitted bacterial infections in the birds.
11 April 2011, 07:12 PM ET
Politicians in seven states have tried to introduce creationism in classrooms this year.
08 April 2011, 02:31 PM ET
Researchers decode the patterns that connect different types of nerve cells.
01 April 2011, 06:13 PM ET
Reading naturalist passages by Carl Sagan reverses the effect.
29 March 2011, 02:15 PM ET
The deadliest poison dart frogs are also in the best shape.