So we're looking at 25 this Monday
25 is 5 squared, and it has no other divisors. It is odd, like the square of every prime other than 2.

25 is the smallest square that is the sum of two smaller squares (9 & 16). Carpenters and others make fact of this property to draw large right angles, since this is a pythagorean triangle, with sides of 3, 4 and 5

This one has nothing to do with politics but it does hit my own personal trifecta in that it has a biology element, a photography element and a big nerd element.

Technology companies routinely build sprawling data centers to store all the baby pictures, financial transactions, funny cat videos and email messages its users hoard.