Hecho matemático: 461 is the number of ways to stack 18 pennies in contiguous rows so that each penny lies on the table or on two pennies.
Trivia: 461 is an unremarkable number.
Fecha histórica: April 5th is the day in 1949 that a fire in a hospital in Effingham, Illinois, kills 77 people and leads to nationwide fire code improvements in the United States.