Collective map of STEM equations and their derivations. Wikipedia style editing but democratic. Changes are submitted by staking you reputation points, then voted on by the community. HW section where you can ask about HW problems by offering a Reputation Points Bounty. You allocate the points to the best answers. I also ran a seed script to populate it, but the derivation order and the explanations are all placeholders. You can make edits and submit these as change proposals.