There are a lot of opinions flying around about COVID-19, also known as the coronoavirus. So, it's hard to know just how freaked out we should be about how far it will spread and the number of people it will affect.
One terrifying term that gets bandied about is "exponential growth." Does that mean that it will eventually expand until it infects everyone? Well, according to mathematician Grant Sanderson, that's not likely.
But that doesn't mean you should stop washing your hands.
In the video below, Sanderson uses his numerical skills to show what the disease's "exponential growth" really means from a pure numerical perspective.
















Volunteers who drive homeless people to shelters talk with a person from Ukraine in Berlin on Jan. 7, 2026.
Tasks that stretch your brain just beyond its comfort zone, such as knitting and crocheting, can improve cognitive abilities over your lifespan – and doing them in a group setting brings an additional bonus for overall health.
Overdoing any task, whether it be weight training or sitting at the computer for too long, can overtax the muscles as well as the brain.

Amoxicillin is a commonly prescribed broad-spectrum antibiotic.
Chart: The Conversation, CC-BY-ND
Counterintuitively, social media can make you feel more bored and lonely.
Talking about what you’ve read can add a social dimension to what can be a solitary activity. 
Women and people of color who experience cardiac arrest are less likely to receive CPR.

Mushrooms containing psilocybin.Photo credit:
Woman undergoing cancer treatments looks out the window.Photo credit:
Friend and patient on a walk.Photo credit: