Thanks for your explaination with examples. What is a column vector? Is it something like (1 2 3) which means move x upwards 1 unit, y up 2 units, z up 3 units?

Do you mean decision-making on food or generally good decision-making? Not sure on what does it mean by reasonable problem solving, could we have some specific examples? Thank you.

Noted with thanks. Btw how to change the modem w/o breaking fibre cables?

Why ISP doesn’t know our activities when we use HTTPS?