The race to develop COVID-19 vaccines is moving swiftly, both nationally and internationally. But challenges remain when it comes to distributing vaccines around the world.
In 2015, the mosquito-borne virus Zika exploded in South America. Health experts predicted it would erupt in Africa. But a major outbreak never happened. Now scientists think they understand why.
Scientists have used a NASA probe way out in space, beyond Pluto, to measure visible light that's not connected to any known source like stars or galaxies.
People who get more deep sleep appear less likely to develop Alzheimer's. That may be because this phase of sleep allows the brain to clear out waste products.
There's growing evidence that a lack of deep sleep increases the risk of Alzheimer's disease. Scientists say that's because during deep sleep, the brain removes toxins associated with Alzheimer's.
Cicadas can stay totally dry in the pouring rain. One researcher is trying to figure out how they do that. This finding may lead to interesting new materials for humans.
Harold McGee talks about how our sense of smell affects taste, why things smell the way they do and the ways different chemicals combine to create surprising (and sometimes distasteful) odors.
Gen. Gustave Perna says as soon as the FDA deems a vaccine safe and effective, his team is ready to coordinate deployment of tens of millions of doses as early as next month.
A team of independent advisers to the Centers for Disease Control and Prevention has a science-based outline for deploying a vaccine when it's ready. The goal is to stop deaths and viral spread fast.
COVID-19 can cause symptoms that go well beyond the lungs, from strokes to organ failure. To explain these widespread injuries, researchers are studying how the virus affects the vascular system.