Cells that control an animal’s spatial awareness can reorient themselves to favor locations that are full of food.
The same neural system could map both the physical and conceptual worlds.
With the technology to add new bases to DNA, scientists now have to figure out if it’s possible to improve on nature’s genetic code.
New genetic evidence suggests our mysterious ancient cousins were more resilient—and more humanlike—than previously thought.
And why did it slow down?