I haven't went to heaven't

Easy. After the 1000 calculations in 1 second, he recalculated carefully in the next seconds. That's when he realizes they're all wrong.

Murderers probably said that quite a lot of times already.

How did I know? It's just a theory... you can trust me

Meanwhile me in my country: uses water only. If the tissue had finished, you can see it the moment you enter. If there's no water, you won't know until when you need it

Barely remembered their faces, but will never totally forget them