This single expression matches the first 18,457,734,525,360,901,453,873,570 digits of e. Euler’s number e is an irrational constant that begins 2.71828… and continues infinitely without repeating. In 2004, Richard Sabey constructed a special expression that uses each of the digits 1 through 9 exactly once. That expression is identical to the classic limit form (1 + 1/n)^n for an extraordinarily large value of n. Because the difference between (1 + 1/n)^n and the true value of e shrinks roughly like 1/(2n), the result agrees with e for precisely as many decimal places as there are digits in that enormous n—exactly 18,457,734,525,360,901,453,873,570 places. The equality of the two power-tower representations of n is an algebraic identity, so the digit count is rigorous rather than approximate. This remains one of the most extreme known pandigital approximations to e.

A lot of people aren't going to want to hear this but much of the "depression" that parents (and not just moms) suffer after child birth is due not so much to hormones but to the fact that children, especially babies, are demanding and difficult and require us to subordinate our own needs and desires for their sake. The more selfish you are, the more of an adjustment it's going to be.