A scholarly look at the digits that matter.

by Nick Norlen

0 Apparent percent of my girlfriend's dreams that don't include me doing something awful — the other night, I took Heidi Montag from The Hills on a date. Those who suffer similarly should seek therapy at Main Line Health's "Pajama Party: Solutions for What Keeps Women Up at Night" on March 27 at 5:30 p.m. at the Bryn Mawr Hospital Health Center in Newtown Square, where ladies can relax with food, mini-spa services, physician workshops and informal sessions on meditation, feng shui and — I'm not sure how I feel about this — dream interpretation. Register by calling 1-866-CALL-MLH.

2 Number of times a month the Philadelphia Swing Dance Society holds dances, such as the one March 22 from 8:45 p.m. to midnight at the Commodore Barry Club, Emlen and Carpenter streets. Beginner lessons start at 7 p.m., no partner is necessary, and admission is $15 — or $12 for those who bring a current student ID or "substantial baked goods." New rule: Admission to anything is $3 cheaper with substantial baked goods. Start adhering, movie theaters!

3 Number of innings that will be played in the "Mascot Baseball Game" — featuring "Buzzbee" from B101, "Phlex" from the Phantoms, "SocceRoo" from the KiXX, and "Mac" the Scottie from Immaculata University — on March 27 from 1 to 3 p.m. in Citizens' Café at the National Constitution Center, 525 Arch St. Free with museum admission. What, the Phanatic, Hip-Hop and Swoop are too busy with quad, trampoline and flapping practice?

40 Approximate number of participants who raised money to have their hair "tamed" last year at The Bald Ball, a charity event — benefiting The Linda Creed Breast Cancer Foundation and Locks of Love — to be held this year on March 27 from 6:30 to 9 p.m. at DiBruno Bros., 1730 Chestnut St. Tickets — which enter you for a chance to win a $250 DiBruno Bros. gift basket and are available at baldball.com — are $45. Which is probably worth it, considering how many $3 discounts you'll get out of that gift basket.

$15,000,000 Amount of the challenge gift donated anonymously to the Central Library's 180,000-square-foot expansion project. Private contributions made through May 31 are eligible for a 100 percent match up to a total of $15 million. Donate at freelibrary.org/expansion or by calling 215-567-7710 and specifying that your donation is for the Campaign for the New Parkway Central. Or the Campaign for Baked Good Rebates. Both good causes.

Can I get your digits? I want to hear about the numerals you need to see. Let a number runner know at runningnumbers@gmail.com.