When Henry Molaison (now widely known as H.M.) cracked his skull in an
accident, he began blacking out and having seizures. In an attempt to
cure him, daredevil surgeon Dr. William Skoville removed H.M.'s
hippocampus. Luckily, the seizures did go away — but so did his
long-term memory! Sam Kean walks us through this astonishing medical case,
detailing everything H.M. taught us about the brain and memory.