With concerns growing over the Delta variant of Covid-19, here's what you need to know about whether you need to start wearing a facemask in public again. MSNBC's Brian Williams talks with Dr. Nahid Bhadelia.

A look at PrEP, a prevention strategy for people at high risk for contracting HIV. Researchers at the University of California explain how pre-exposure prophylaxis (PrEP) works as they describe a four-year, multi-pronged study of men who have sex with men in Los Angeles and San Diego. Participants a...

16 climate activists teens and children are petitioning the United Nations with claims that the boy is violating children's rights by not taking action on climate change and global warming. Global climate strike leader Greta Thunberg is among the activists taking climate action against the UN. Thunb...

The first case of a crocodile who made herself pregnant has been identified at a zoo in Costa Rica.
She produced a foetus that was 99.9% genetically identical to herself. The phenomenon of so-called "virgin birth" has been found in species of birds, fish and other reptiles, but never before in croc...

Robert Vonderheide, MD, DPhil, discusses his research on a new, immunotherapeutic approach to treating pancreatic cancer. Dr. Vonderheide is an associate professor of medicine at the University of Pennsylvania School of Medicine. Abramson Cancer Center physicians Gregory Beatty, MD, PhD, and Peter O...

Russian extreme sports star Valery Rozov successfully carries out the world's highest base jump, leaping off the north face of Mount Everest. The extreme sports enthusiast leaped off Mount Everest to mark 60 years since Edmund Hillary and Tensing Norgay conquered the world's highest mountain.

The Temple University School of Medicine research team's approach looks promising as they work towards a permanent cure and potential for protection against HIV. "This is one important step on the path toward a permanent cure for AIDS," says Kamel Khalili, PhD, Professor and Chair of the Department ...

NASA May Have Found the First Planet in Another Galaxy. “We know we are making an exciting and bold claim so we expect that other astronomers will look at it very carefully,” study co-author Julia Berndtsson of Princeton University said in a statement. “We think we have a strong argument, and this

NBC News’ Dr. John Torres breaks down what you need to know to stay safe as the COVID-19 coronavirus continues to spread around the world. "It belongs to a large family of viruses called coronaviruses. These viruses can cause respiratory illnesses such as the common cold, and more severe illnesses s

The interstitium, the shock-absorbing tissue underneath the skin, gut and blood vessels, has been identified as an organ for the first time according to a new study.