In honor of the occasion, a maths problem:
A 3 foot by 5 foot rectangular flower bed is surrounded on its edges by a border of petunias of uniform width 1 foot. In square feet, what is the area of the border of petunias?
9 (not the previously stated 20)

Of course, elsewhere that US we could celebrate Pi Day on 31 April (if only April had 31 days)
As it is we'll have to wait for 3 January '41 @ 5:9:26