Model and MTV host Alexa Chung turns 26 today. Yankees star Johnny Damon has two reasons to celebrate today: The Yankees won the World Series last night, of course; and it's also Damon's 36th birthday today. Ryan Adams is turning 35 today. Bryan Adams is turning 50. (Confusing!) Tilda Swinton is 49. Economist Jeffrey Sachs is turning 55. Actress Tatum O'Neal is 46. Folk legend Art Garfunkel turns 68. Famke Janssen is 44. Actor Sam Rockwell is turning 41. Kevin Jonas of the Jonas Brothers is 22. And Kris Jenner, the woman to blame for creating all those Kardashian girls, turns 54 today.

Did you know that Kim Kardashian is in Botswana at the moment? (That's the country in Africa named Botswana, by the way, in case you were thinking it might be some new jungle-themed club in LA.) What could possibly explain Kardashian's decision to travel to such a poor African country? Diamonds, of course! Kim and boyfriend Reggie Bush made the trip as "representatives" of Russell Simmons' Diamond Empowerment Fund, a foundation backed by companies like DeBeers that assists "economically disadvantaged people in African nations where diamonds are a natural resource." But DeBeers & Co. is totally getting its money (or diamonds') worth. Kardashian is learning all sorts of interesting things about the economy of Africa, and she's sharing her newfound knowledge on Twitter: "Did u know that 75% of Botswana's economy is supported by diamonds?" Actually, we didn't. But now we do! We fully expect to see Kim talking economics with Jeffrey Sachs when she gets back to the States. In the meantime, you'll find a few more of Kardashian's revelations—opposite a photo of Kim in a bikini, weirdly—below.

Ryan Adams turns 34 today. Yankee Johnny Damon is 35. Celebrity economist Jeffrey Sachs is celebrating his 54th. Art Garfunkel is turning 67. Actress Tatum O'Neal is 45. Kevin Jonas of the Jonas Brothers turns 21. Famke Janssen is 43. Author Joyce Maynard is 55. Actress Tilda Swinton is turning 48. Sam Rockwell is 40. And Kris Jenner, the woman who you can thank for bringing Kim Kardashian into this world, is 53.

The head of Columbia University's Earth Institute, founder of the non-profit group Millennium Promise, and friend of Angelina and Bono, Sachs may very well be the only economist you've ever heard of.