As you may have read yesterday in my weekend activities post, tomorrow (March 14) is Pi Day, a celebration of pi (3.14), the ratio of a circle's circumference to its diameter. Besides going to the pi fest at the Maryland Science Center to see what they have in store, here are some other fun (and, sh!, educational) things you can do with children to celebrate:

--Your kids may not know that 3.14 is just the rounded version of pi, which actually has endless digits beyond its decimal point. You can find 10,000 of them, along with other fun pi facts, at The Joy of Pi. Then convert the digits into a musical sequence here.

--Learn about pi's history here.

--This site from Scholastic offers activities geared to different age groups, including fun with balls and hoops for the younger set and pie chart ideas for older kids.

--Pi Day is also Albert Einstein's birthday. Kids can learn about him here.

--Make Irish salmon pie for dinner. Here's the recipe from an Emeril Lagasse kids' cookbook we tried last year. Or make pie for dessert. And, hey, if you don't want to cook, pizza makes the pi-pie tie-in beautifully.

(Photo of last year's Pi Day at the Maryland Science Center by Baltimore Sun photographer Lloyd Fox)