Living robots made in a lab have found a new way to self-replicate, researchers say

Xenobots, a type of programmable organism made from frog cells, can replicate by spontaneously sweeping up loose stem cells, researchers say. This could have implications for regenerative medicine.(Image credit: Douglas Blackiston & Sam Kriegman)

1h

Ancient footprints mistakenly attributed to bears were made by early humans

A new look at nearly 3.7-million-year-old fossil footprints uncovered in Tanzania shows that multiple species of early humans lived together at the same time. (Image credit: Ellison McNutt)

1h

Conservationists flew 30 white rhinos to Rwanda in a huge operation to protect them

The roughly 2,000-mile journey took the rhinos to their new home in Akagera National Park, where advocates hope the animals will be able to establish a new breeding stronghold and evade poachers.(Image credit: Martin Meyer & African Parks)

1d

Climate change and city lights are tricking trees into growing leaves too soon

A study of trees in dozens of cities found that urban heat and light pollution are pushing urban trees to sprout leaves about a week earlier than trees in more rural settings.

1d

How Black tech entrepreneurs are tackling health care's race gap

Determined to improve the way doctors connect with their patients, a new wave of innovators are using technology to match people of color with culturally competent professionals.(Image credit: Kevin Dedner; Kolin Mendez Photography; Aaron Gang Photography; Starboard & Port Creative)

2d

For patients with long COVID, chronic fatigue syndrome may offer a guiding star

Long COVID has been a reality since the beginning of the pandemic. The patients who have it are desperate for answers that doctors don't yet have.(Image credit: Helena Kubicka de Bragança)

2d

Once rare, lung transplants for COVID-19 patients are rising quickly

When it comes to receiving organ transplants, patients are not usually judged on prior behavior, but some doctors are questioning whether unvaccinated COVID patients should qualify for new lungs.(Image credit: Vezna Hang )

3d

How vaccine-makers plan to address the new COVID-19 omicron variant

A new coronavirus variant, first discovered in South Africa, has begun to spread around the globe. Vaccine producers say they're working to get ahead of the new strain.(Image credit: Jerome Delay/AP)

3d

Does omicron pose a risk to the vaccinated? Too early to tell, epidemiologist says

NPR's David Folkenflik speaks with Harvard epidemiologist Bill Hanage about what scientists know about the new omicron COVID-19 variant.

3d

The omicron variant spreads across Europe as new travel bans take effect

Cases of the latest COVID variant of concern — first identified in South Africa — have been reported in the U.K., Germany, Italy and elsewhere. Travel from southern Africa is now restricted.(Image credit: Phill Magakoe/AFP via Getty Images)

4d