Hang some time on wikipedia Apple designed processors trying to guess how many cores modern iPads and iPhones have. Short answer is: 6 or 8.

Watched Everything You Ever Wanted to Know on Sequence & Collection by Soroush Khanlou. Soroush says that extending sequence one should remember that sequence might be consumable (means it could be iterated only once) but gives as example implementation of eachPair which internally consumes sequence twice.

Watched Keep Calm and Type Erase On. I have already watched this some time ago. Nothing new.