Did you know there are three "unlucky" Friday the 13ths in 2012? Even freakier, they are each 13 weeks apart. Find out more strange occurrences and freaky facts associated with this day at LiveScience.com.
Seán O Nualláin spoke about the Foundations of Mind. Followed by James Secord on 19th century science, and Paul Stonehill on mysteries of Matua island.