The US and Iran charged each other with ratcheting up tensions in the Persian Gulf as concerns about potential conflict build days before Iran marks one year since the US assassinated its most powerful military figure and less than three weeks before President-elect Joe Biden takes office.
A new treatment could restore some mobility in people paralyzed by strokes 
What has Perseverance found in two years on Mars? 
This robot automatically tucks its limbs to squeeze through spaces 
Greta Thunberg’s new book urges the world to take climate action now 
Glassy eyes may help young crustaceans hide from predators in plain sight 
A chemical imbalance doesn’t explain depression. So what does?