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On December 23rd, 1953 at the Peter Bent Brigham Hospital in Boston, a team of surgeons carefully removed a healthy kidney from a 23-year-old man named Ronald Herrick. Working quickly, they wrapped the donor organ in a cold, wet towel, placed it in a stainless steel dish, and carried it into a different operating room. There, Ronald’s identical twin Richard lay dying of chronic nephritis. His brother’s healthy kidney was his only chance at survival.The transplant, led by Dr.

For much of the 20th century, the peanut butter and jelly sandwich was considered a quintessential food of childhood. But that was before the rise of peanut allergies, a condition in which even the slightest exposure to peanut protein can set off a catastrophic allergic reaction.

In literature, a "chimera" is a creature from Greek mythology that is made of parts from different animals. Perhaps the most famous chimera is "Cerberus," the part dog, part snake who was captured by Hercules in his final labor.In immunology, a chimera refers to an immune system consisting of cells from different individuals.