Robert Krulwich/NPR Krulwich Wonders... Animal Loses Head But Remembers Everything December 31, 2013 They look like fettuccine come to life — little flatworms that glide along riverbeds and perform miracles. Chop off their tails, they grow them back. Split them in half, they grow whole again. But chop off their heads, and not only do they grow new heads, but those new heads contain old memories! Whoa!