The first diverging animal on earth was commonly believed to be the simple sponge, until experiments in 2008 suggested that the more complex comb jelly actually came first.
While previous research pointed to the domestication of dogs beginning in Asia, new research suggests finds that the first dogs descended European wolves.
The primary stress hormone in humans is cortisol, which increases the brain’s use of glucose and puts the body in fight-or-flight mode. Constant stress causes an overexposure to cortisol, potentially disrupting the body’s processes and causing health risks like heart disease, depression and weight gain.
The term “artificial selection” was first used by Charles Darwin to illustrate how plants and animals derived special properties from intentionally breeding that favored positive characteristics and excluded negative traits.
Corn is derived from a Mexican grass called teosinthe, which was domesticated to create maize over 9,000 years ago.
The shrinkage of the Arctic ice cap due to global warming causes the replacement of the ice with dark water. As a result, the surface of the Arctic Ocean absorbs more heat, melting the land ice of nearby Greenland.
Scientists believe that a 100,000-year-old fossilized jawbone, found on an island in the Arctic Ocean, is the remains of the oldest-known polar bear.
In 2006, a hybrid grizzly/polar bear was found in Northern Canada, providing proof that the two types of bears can interbreed. Additional DNA testing found that Alaskan brown bears were a closer genetic match to polar bears than to other brown bear breeds.
Human eyes operate like cameras, using a lens to focus images and light onto the retina, a light-sensitive membrane lining the inside of the eyeball.
The largest moon of Saturn, Titan is one of the most earth-like bodies to exist in our solar system, containing bodies of liquid ethane and methane that forms clouds and even rains.
February 21, 2014