# TIL (Today I Learned)

The TIL series of articles contains very short articles documenting something I learned “today”.

##### TIL #021 – Spouge's formula

Today I learned about Spouge's formula to approximate the factorial.

##### TIL #017 – symmetrical indexing with bitwise inversion

Today I learned about the symmetry in indexing from the beginning and end of a list with the bitwise invert operator.

##### TIL #015 – DARPA network challenge

Today I learned about the DARPA network challenge and the power of referral systems.

##### TIL #012 – At operator for matrix multiplication

Today I learned that Python 3.5+ supports the operator @ for matrix multiplication.

##### TIL #007 – math.nextafter

Today I learned about the math.nextafter method.

##### TIL #001 – ceiling division in Python

Today I learned how to do ceiling division in Python just with //.