When Joseph Cook first landed on the Greenland ice sheet in 2010, he was expecting to see a pristine white environment. What he found was a “colorful patchwork” — from blacks and grays to greens, purples and browns, with neon blue melt streams cutting through the ice.
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?