Seeing your child mix up b and d when reading or writing can feel alarming. But here’s the good news: it’s incredibly common ...

The virus killed at least 20 million people, wiped at least $10 trillion from the global economy and upended billions of lives.

In most scenarios, highly effective contact tracing and case isolation is enough to control a new outbreak of COVID-19 within 3 months. The probability of control decreases with long delays from ...