We all have that one friend who just loves to drop random facts into conversations, just to prove they know stuff. For Dermot, Dave is that friend!

If you’ve ever wondered why airports are laid out the way they are, what you can do at the speed of sound, or what colour eyes you’re best off having, then Dave’s World is the place for you!

This morning he amazed us with some cool facts about Alcatraz prison, explained to producer Eimear why she is so 'rare', told us of a helmet worth $400,000 and how baby's learn their accents.

 You can listen to the chat in full by pressing the play button in the headline image above.