“In the wild, horses’ hearts sync up. That’s how in the herd, if one notices a mountain lion, a horse a mile away notices it too, and they all start running together. They sync their heartbeats to each other.
“In the wild, horses’ hearts sync up. That’s how in the herd, if one notices a mountain lion, a horse a mile away notices it too, and they all start running together. They sync their heartbeats to each other.