There are some skills that we should have by default, don't you think? I even numbered them, look how luxurious:

1- Know how to write and speak well enough to be able to express ideas without too many obstacles or distractions. In your own language, of course.

2- Calculate basic operations in your head.

3- Have that naughty critical sense so you don't believe in any crap.

I'm weak in 3, but in 2, my friends... I can count on my fingers 5 + 3, I swear. This year I have to figure that out.