Does having a friend nearby make pain more bearable? Researchers at the University of Virginia conducted a fascinating study to answer that question. They wanted to see how the brain reacted to the prospect of pain, and whether it behaved differently if a person faced the threat of pain alone, holding a stranger’s hand, or holding the hand of a close friend.

Researchers ran the test on dozens of pairs, and found consistent results. When a person was alone or holding a stranger’s hand while anticipating a shock, the regions of the brain that process danger lit up.  But when holding…