But here we are.” (Pig brain cells may have cured a sea lion's epilepsy—are humans next?) A version of this story appears in the June 2025 issue of National Geographic magazine.

And while the physiology of a pig is discordant with that of a human ... A version of this story appears in the April 2025 issue of National Geographic magazine.

After decades of hype and setbacks, scientists have made impressive progress into tricking stem cells into repairing organs.

Sure enough, the next spring, a colleague returned to the warty pig enclosure and recorded three of the four animals using tools to complete their nest, an earthen pit filled with leaves.