Omicron is sweeping away the delta variant, having impacts on hospitalization and population immunity.
Alan Gosling, 79, is reportedly feeling "fine but very lonely."
Greenland sharks may have a lifespan of hundreds of years in the Arctic and North Atlantic oceans, where much about their lives remains a mystery.
The seasonal flu shot is a yearly vaccine that protects against the flu, or influenza. Here's what you need to know about it.