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15 October 2014, 01:36 PM ET
The second health care worker to test positive for Ebola should not have traveled on a plane from Ohio to Texas the day before she showed symptoms of the disease, the head of the Centers for Disease Control and Prevention said today.
15 October 2014, 12:14 PM ET
The catastrophic 1934 drought is one of the worst North America droughts on record, and was caused, in part, by an atmospheric condition that may have led to the current drought in California, a new study finds.
15 October 2014, 11:48 AM ET
A health care worker who tested positive for Ebola flew on a plane the day before she developed symptoms of the deadly disease, the Centers for Disease Control and Prevention announced today.
15 October 2014, 10:05 AM ET
Amazing images every day!
15 October 2014, 09:09 AM ET
A second health care worker in Dallas has tested positive for Ebola after caring for a patient who had the disease, the Centers for Disease Control and Prevention said today.
15 October 2014, 08:34 AM ET
A mysterious stone slab from the 12th century B.C. is a combination sundial and moondial, a new study finds. The slab would've helped ancient skywatchers track the movements of the sun and moon during heavenly events.
15 October 2014, 07:36 AM ET
Check out these photos of a combination sundial-moondial dating to the 12th century that was discovered near Rostov, Russia. Archaeologists say the markings on the artifact correspond to positions of the sun and moon throughout the year.
15 October 2014, 07:27 AM ET
The U.S. Department of Defense released a new report Oct. 13 that says climate change poses an "immediate risk to national security." The so-called road map is designed to help the military navigate and prepare for increasing global temperatures.
15 October 2014, 07:16 AM ET
Pairing up might seem to be a good protection against sexually transmitted diseases, but STDs seem less likely to promote monogamy than promiscuity in most evolutionary scenarios, new research suggests.
14 October 2014, 07:17 PM ET
It may take more than a month for symptoms of head lice to show.
14 October 2014, 06:56 PM ET
The rats that dart between trashcans and crawl across subway tracks in New York may harbor some alarming diseases, according to a new study.
14 October 2014, 06:30 PM ET
Stem cells, with their ability to develop into many different types of tissue, have long been touted for their promise in regenerative medicine, yet treatments have been slow to develop. But now, a small study found that more than half of people given an
14 October 2014, 05:00 PM ET
Another rare case of fracking-caused earthquakes has jolted Ohio.
14 October 2014, 04:01 PM ET
A NASA mission is measuring biofuel emissions and contrail formation by flying jets directly behind a large aircraft.
14 October 2014, 03:39 PM ET
The discovery of several mysterious craters in Siberia earlier this year launched a wave of speculation about their origins. Now, a new report suggests an explanation for the holes, claiming it could also be linked to the mysteries of the Bermuda Triangle
14 October 2014, 02:07 PM ET
To test the safety and efficiency of a giant helicopter, researchers recently dropped one from three stories in the air.
14 October 2014, 02:05 PM ET
Health officials are making immediate enhancements to improve safety at U.S. hospitals treating Ebola patients after a nurse became infected with the virus.
14 October 2014, 01:56 PM ET
A backpacker from Scotland recently found that the cause of her frequent nosebleeds was a 3-inch-long leech living inside her nose, for at least a month.
14 October 2014, 11:29 AM ET
The current Ebola virus outbreak in West Africa has killed more than 4,000 people, but it started with one person: a 2-year-old child who died on Dec. 6, 2013.
14 October 2014, 11:29 AM ET
Smoking is to blame for about 14 million major medical conditions among American adults in a single year, a new study shows.
14 October 2014, 11:27 AM ET
An Apple-1 computer, a window from the Manhattan Project test site and letters from Albert Einstein and Charles Darwin will go on sale at a history-of-science auction this month.
14 October 2014, 11:06 AM ET
Rocks found in the deep ocean near methane vents are teeming with microscopic life, new research finds. Microbes live in (and build) these rocks, surviving on the greenhouse gas methane seeping from below the ocean floor.
14 October 2014, 10:28 AM ET
Scientists previously thought that the moon's volcanic activity died down a billion years ago. But new data from NASA's Lunar Reconnaissance Orbiter, or LRO, hints that lunar lava flowed much more recently, perhaps less than 100 million years ago.
14 October 2014, 09:09 AM ET
A new drug for type 2 diabetes that is switched on by blue light might one day give patients with the disease more control over their blood sugar levels, some researchers say.
14 October 2014, 09:08 AM ET
An Iron Age chariot burned as a sacrifice more than 2,000 years ago is rediscovered in Leicestershire, England. The find, made by four university students, is a "once-in-a-career" discovery, according to archaeologists.
14 October 2014, 07:51 AM ET
Physicists have discovered a new particle from data from the Large Hadron Collider that could reveal how protons in atomic nuclei are held together.
14 October 2014, 07:43 AM ET
Three arm bones from a prehistoric individual, likely a Neanderthal, were uncovered in the Seine Valley of northern France, suggesting that Neanderthals had a temporary camp along the river 200,000 years ago.
14 October 2014, 12:06 AM ET
Archaeologists have discovered ornate bronze remains of an Iron Age chariot from the second or third century B.C. The chariot seems to have been buried as part of a religious offering, say the archaeologists.
13 October 2014, 08:13 PM ET
Whooping cough, also known as pertussis, is a bacterial infection of the respiratory tract that causes severe coughing. The disease is especially serious for babies.
13 October 2014, 06:10 PM ET
Winners of the Nobel Prize in economics, including Paul Krugman, Daniel Kahneman and Milton Friedman.
13 October 2014, 05:37 PM ET
A "breach in protocol" led a nurse in Dallas to become the first person infected with Ebola in the U.S., according to the Centers for Disease Control and Prevention.
13 October 2014, 05:32 PM ET
Bringing a new perspective to the "mysteries of the unknown."