Happy 25/4! On this day in history:

• in 1840 Siméon Poisson died :(
• in 1849 Felix Klein was born :)
• in 1903 Andre Kolmogorov was born :)
• in 2012 The Aperiodical launched! :D

So we’re a year old. Thanks for reading! Have a slice of cake:

To celebrate, CP has been hard at work redesigning the site. Hope you like it!