but many folks have trouble figuring out what to write in a birthday card other than the obvious 'happy birthday' phrase. Thankfully, finding the right birthday card messages is a piece of cake!

“Happy Birthday” may be the Hill sisters' main claim to fame, but Patty (left) and Mildred's (right) impact on American history extends far beyond the beloved song. Illustration by Meilan ...

However, gone are the days when you have to drop by your local greeting card shop to buy your friend a birthday card. Nowadays, you can just send them a digital card instead. One of the best ways ...

Check out the tracks that will make you party like it's your birthday. Gathering friends and family around a candlelit cake to sing “Happy Birthday ... Mildred and Patty Smith Hill for the ...

With her birthday falling on April Fools' Day, she has a tradition of her own to uphold as well. She sends cards out to friends and family, wishing them a happy birthday on April 1, too.