Wikipedia, the online encyclopedia, has been used as a major learning tool for many people across the world for 20 years now, assisting the lives of not only students but also eager learners that enjoy its free access.

The variant in Brazil is causing a surge in Manaus, a city where the virus previously infected huge numbers in the spring of 2020. Researchers are trying to determine why.

Daily numbers of new cases are finally starting to wane, and hospitalizations are down slightly. But health care systems are still overburdened and another resurgence remains a threat.

For two of the biggest obstacles to curbing the pandemic, it won't just be federal officials who will lead the way, says Dr. Celine Gounder, a member of President Biden's COVID-19 advisory board.

Two studies find that tailoring brain stimulation to a particular patient helps in treating depression and obsessive-compulsive behaviors.

In our continuing series looking at the latest medical research and news on COVID-19, Larry Mantle speaks with Dr. Kimberly Shriner, infectious disease specialist at Huntington Hospital in Pasadena.

It’s official. President Joe Biden has now been sworn into office.

President-elect Biden plans to end the Trump administration's travel ban on Muslim-majority countries on Day 1. But immigrant advocates say the lasting effects of the policy will be harder to undo.

The vaccine is now being used in Brazil, Indonesia and Turkey for starters. But there are conflicting reports about its degree of effectiveness.

"Humility and confidence should be the flip sides of America's leadership coin," Blinken will testify at his Senate confirmation hearing, vowing to work for the "greater good."