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INTERNATIONAL DAYSCIENCE & TECH

E-Day

Every year on February 7, math gets its own birthday party. Pi Day hogs the spotlight on 3/14, but February 7 quietly does the same trick for another famous number. Written in month-day form, 2/7 echoes the first two digits of the mathematical constant e, about 2.718. It is a day for exponential enthusiasts and calculator romantics, and for anyone who ever raised something to a power and felt a little thrill.

FEB7
Sunday, February 7Every year on February 7
 days to go
Roots
A grassroots math holiday built on the date 2/7, the start of e = 2.718...
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#EDay
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3 ways to celebrate

AT HOME

Mark the Moment at 18:28

Set a timer for 18:28 on February 7, the hour that turns 2/7 into 2.718, and toast the constant with coffee and a blank notebook. Try writing the digits of e from memory to see how far you get.

WITH FRIENDS

Bake an e Cake

Ice the digits 2.71828 onto a cake or pizza and challenge friends to each recite one more digit than the last. The loser refills the coffee.

AT SCHOOL OR IN THE COMMUNITY

Run a Growth Experiment

Walk through Bernoulli's compound interest discovery: compound a dollar in ever smaller fractions and watch the total approach e. It is the most memorable math lesson of the winter.

Fast facts

The constant e is both irrational and transcendental: its infinite digits never fall into a repeating pattern, just like pi.
Mark it at 18:28, the hour that turns 2/7 into 2.718, or raise a glass on July 2 if your country writes the date day-first.

Keep the party going

See the calendar
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