The wikipedia article Polydactyly in stem-tetrapods has some explanations on how we ended up with 5 fingers and toes.

The gist of it is that tetrapods (four-limbed vertebrate animals) evolved from a fish similar to a lobe-finned fish that had 5 sets of bones in each of its fins that evolved into fingers and toes. Some tetrapods have subsequently lost digits but the basal state was five.

There’s a book, Your Inner Fish by Neil Shubin that’s full of this kind of stuff. Highly recommend.

Ska 'za? Nah brah.

Yeah probably true. I only thought to look it up because I knew active and passive sonar was a thing.

Passive radar?

lambs and sloths and carp and anchovies and orangutans and breakfast cereals and fruit bats

And how precise is the telekinesis?

Also what range. Could you remotely rear naked choke anyone in the world, or just apply a leg press of a couple hundred pounds to their brain stem or some shit? Punch world leaders in the nuts at will? Crash planes by fucking with flight controls? Deorbit satellites? Divert asteroids into earth’s path?

Also, could you double jump or straight fly with it?

Manipulate roulette balls for quick money or meddle in sporting events you bet on (just telekinetically stuffing basketball shots and putt attempts and shit would be hilarious). Seems like telekinesis would be amazing.

Traditional shocker is “two in the pink one in the stink”.

machining

No idea about your algorithm problems but have you seen the Cutting Edge Engineering Australia channel? It’s so good.