Check out some impressive numbers on David Letterman—everyone’s favorite TV curmudgeon—who has spent 33 years on late night.

*

Speaking of 33, a recent study tells us you’ll stop listening to new music at that age.

*

Intriguing Headline of the Day: Andy Warhol Interviews Frank Zappa (Whom He Hated) Without Uttering A Word

*

You better save up if you want to ride around town on one of the five most expensive motorcycles on Earth.

*

Speaking of nifty wheels, 90-year-old tortoise Mrs. T just got a new set to replace her front legs. The picture of her is great.

*

If you bemoan the constant and all-consuming encroachment of cell phones in our daily life, then you will get a kick out of these cartoons that depict the death of conversation.

*

If you need to get up-to-speed before seeing the new Avengers film, this video takes you through the entire Marvel film journey in 13 minutes.

*

TED Talks: Why We Laugh