/sci/ - Science & Math

I can't into probability.
If I'm walking down a street with a illegal object, and a car comes by every n seconds, what is the chance I'll be spotted?

Can someone explain to me how these heads up displays that are really close to your eye actually work? Like how do they trick your eye into thinking you're looking at something far away?
If I put my eye really close to my retina display iphone, regardless of the fact that the pixels are microscopic, it's still blurry as shit.

I want to understand how screens inside your minimum focal distance can actually display information without being blurry.