Were the "Little House on the Prairie" books really co-written by Laura Ingalls Wilder's daughter Rose? Historian Alexis Coe investigates.

• 1:39

• TV-14
  1:15

Watch videos about mathematician, codebreaker, and computer pioneer, Alan Turing.

Naomi Ekperigin talks about Alan Turing's accomplishments in computing during World War II, his conviction for "gross indecency," and his suicide at the age of 41.

• 3:06

• TV-14
  1:13

• TV-14
  2:07

• TV-PG
  3:41

• TV-14
  2:07