March 14 is Pi Day, which is an auspicious day for MIT alums. Admissions decisions are announced on Pi Day. It’s also a major fundraising day, with matching gifts for dozens of opportunities in a 24-hour Pi Day Challenge. Today, I made a donation to the Priscilla King Gray Public Service Center. The PKG Center runs service programs for MIT students to contribute their talents and energies to solve the world’s greatest problems.