Former 'Two and a Half Men' star Charlie Sheen says he is HIV-positive.

Activists raise awareness of HIV pill that lowers risk

A daily pill that can slash the risk of HIV remains an unknown to thousands of primary care doctors and nurses, a federal agency cautioned.

about 1 hour ago

 Jason T. Wright, professor of astronomy and astrophysics at Penn State University.

Astronomers are baffled by the light coming from a distant star

Astronomers are trying to figure out what is causing a star in the northern sky to dim so dramatically.

1 day ago

 A feeding female Anopheles stephensi mosquito crouching forward and downward on her forelegs in the process of obtaining its blood meal through its sharp, needle-like labrum. Malaria is spread when a mosquito bites an infected person then bites someone else.

Altered mosquito gene blocks malaria

The experiment has implications far beyond the promise of fighting malaria.

1 day ago

 Migrating monarchs

Earthweek: Diary of a changing world

Events in the world’s climate for the week ending Friday, Nov. 20.

4 days ago

Scientists discover how ocean fish disappear

A studysays that two ocean fish have fine-tuned a method of avoiding predators by hiding in light.

4 days ago

Scientists witness planets being born

Their discovery could give scientists new insight on how planets come to be and what they are like in their formative years.

5 days ago

 Seventh-graders watch the sky constellations during a Nov. 11 demonstration.

Traveling planetarium comes to Bethel Park middle school

The students viewed constellations, stars and planets in a program by the Spectroscopy Society of Pittsburgh.

5 days ago

NIH ends the era of U.S. medical research on chimpanzees

Director Francis Collins announced Wednesday that 50 chimpanzees held by the government for medical research will be sent to sanctuaries.

6 days ago

 Rijuven Corp. CEO Evens Augustin demonstrates how to operate a CardioSleeve on a mobile phone. The device monitors and records a patient’s heartbeat and EKG.

New device aims to streamline stethoscopes, make patient assessments faster

Rijuven Corp CEO Evens Augustin said the device — called a clinic in a bag — amps up the capabilities of the stethoscope.

6 days ago

 People watch the MegaBots 15-foot tall, piloted Mark II robot in action at the Pioneer Summit in Redwood City, Calif.

U.S. startup challenges Japan to giant robot battle

It will be the first giant robot battle of its kind next year. The exact date and location are yet to be determined.

1 week ago

 Andriy Bohdan drives his Cranberry Taxi while looking for airport fares at hotels in Downtown Pittsburgh. "I've gotten better, doing more driving," he says about learning routes.

Study: Navigational skills help improve brain functions

A Carnegie Mellon University study explains how and why the hippocampus region of the brain grows during route planning and navigation.

1 week ago

Mars might be tearing its own moon apart

Phobos is just 3,700 miles from the surface of Mars, over 60 times closer than we are to our own moon.

1 week ago

 The Leonid Meteor Shower will peak tonight and early Wednesday morning.

Stargazing: Leonids peak tonight

The Leonids occur every year around Nov. 17, when Earth plows through a cloud of dusty debris from comet Tempel-Tuttle.

1 week ago

 Dr. Eduardo D. Rodriguez displays an image from the face transplant done for Patrick Hardison, a Mississippi firefighter whose face was severely burned in a fire 14 years ago.

Burned firefighter receives extensive face transplant

Former volunteer firefighter Patrick Hardison had undergone more than 70 surgeries that involved multiple grafts from his leg to his face.

1 week ago

The meek will inherit the Earth?

A mass extinction called the Hangenberg event led to a reduction in vertebrate size for around 40 million years afterward.

1 week ago

Let's talk about science: Black holes

A black hole is a very strange and destructive object in the universe.

1 week ago

Scientists tout discoveries of planet, ‘pristine’ relic stars

A small planet has been spotted just 39 light-years away. Meanwhile, Australian astronomers said they discovered the oldest stars ever seen.

1 week ago

Space revolution hatching in a New Zealand paddock

Rocket launch range to open in New Zealand.

2 weeks ago

Solar storms stripped Mars of atmosphere

The planet’s early atmosphere is thought to have been as thick as or thicker than Earth’s today.

2 weeks ago

 An example of the 3-D printed hair by Gierad Laput, a Ph.D. student at CMU's Human-Computer Interaction Institute.

CMU researchers develop technique for printing hair strands

The use of 3-D printing is expanding to create soft hair-like images through “furbrication.”

3 weeks ago

 Kelli Jo Lovich visits the grave of her 4-year-old son, Colbee, in mid-October in Butler. “I visit him twice a day, every day,” she said. Colbee was killed in an ATV accident in 2014. Mrs. Lovich decided to donate his organs to help preserve his memory.

Faced with tragic loss, families must face the difficult choice of organ donation

For organ procurement coordinators, the job can be physically and emotionally grueling. Shifts of 24 hours or longer are common.

3 weeks ago

Large asteroid set to shoot past Earth Saturday

The flyby is expected to provide one of the best opportunities in years to gather data about a passing space rock.

3 weeks ago

 This image taken July 8 and provided by the European Space Agency shows the activity from Comet 67P/Churyumov–Gerasimenko.

Oxygen found on Rosetta's comet

The discovery could change the understanding of how the solar system formed.

3 weeks ago

 After formally announcing its latest customer Monday in Tokyo, Astrobotic president John Thornton, left, shakes hands with Team AngelicvM CEO Mauricio Guerrero and Takeshi Hakamada of Team HAKUTO, which had previously signed on with Astrobotic. All three are competitors in the Google Lunar XPrize race to the moon.

Pittsburgh's Astrobotic lands another customer for its payload in race to moon

Signing Team AngelicvM, a competitor in the Google Lunar XPrize race to the moon, is “a big step forward," Astrobotic officials said.

4 weeks ago