March 14th is Pi Day, a day for science nerds, the math-curious, and the pie lovers among us to celebrate the universe and the eponymous infinite number Pi (3.14159…). Learn something new, make a statement or have a slice of the delicious food, at these Bay Area events.

Pie for the Earth

Key lime and chocolate-cream pies will make one-day-only appearances on the Arizmendi Bakery menu this Tuesday. $3.14 from every slice of deliciousness will be donated to Earth Justice to support climate science and environmental protection. // 1331 9th Ave. (Inner Sunset), arizmendibakery.com

Scientist's Pi Day Puzzle Party

Test your math and logic skills at SoMa Streatfood Park's puzzle competition. Grease your mental wheels with delicious brain food from Streatfood's ten gourmet food trucks. // 7-9:30 p.m., 428 11th St. (SoMa), somastreatfoodpark.com

Tech Stands Up Pi Day Rally

Join Silicon Valley's tech workers and science lovers in a protest against the current administration's dubious scientific beliefs. Organizers hope this event will help build community connections and urge leaders to speak out about policies that affect the tech world. // 2-6 p.m., 250 Hamilton Ave. (Palo Alto)

Exploratorium's Pi Day Party

Admission is free this March 14 in honor of the infinite number. Attend a math lecture, join activities such as the Pi Procession (at 1:59 p.m.), and don't forget to stop by the North Gallery at 2:15 p.m. for a slice of tasty pie. // Open 10 a.m.-5 p.m., Pier 15 (Embarcadero), exploratorium.edu

Irrational Pie Day Party

No one throws a party like mathematicians! Games, prizes, pizza, pie and, of course, beer, will all be up for grabs at IXL Learning's headquarters. // 5:30-8:30 p.m. 777 Mariner's Island Blvd. (San Mateo), blog.ixl.com

Intelligent Pizza Options

If your pie preference is of the cheese-topped persuasion, these Bay Area pizza purveyors are offering Pi Day specials:

• $3.14 for any pizza pie at Blaze Pizza (multiple locations around the Bay), blazepizza.com
• $5 off any large pie at Paxti's (multiple locations around the Bay), patxispizza.com
• Download and install (or update) the Pythagoras Pizza app and get a free pizza to give away.(multiple locations around San Francisco), getpi.co
• Settle in for mathematical movies and $3.14 pizza slices at Spark Social SF (Mission Bay), sparksocialsf.com