Есть такие люди, которые помогают безвозмездно!!!

«Is it so boring to live in ..mmm...small European city, that you are answering to people...»

«Physics — it is about the accurance», — tells me this guy.
And actually, after renumerating 220 folders by different names in computer not to forget the 334 subfolders of the figures- you can understand it. Or even you can feel it.
But!
Sometimes because of the mistakes (maybe in renumerating...) you can produce something new!

«Physics is also about waiting...»
«Physics is about real life» as Greek people said…
«Physics is also about drinking coffee and watching the smoke» (Sokolov)
p.s.
Dissolving sugar in coffee. (Problem)
On a cold winter’s day you pour a cup of coffee and
add 2 g of sugar evenly distributed over the bottom
of the coffee cup. The diameter of the cup is 5 cm;
its height is 7 cm. If you do not stir the coffee, when
does the concentration boundary layer first reach the
top of the cup and when does all of the sugar dis-
solve? How would these answers change if you stir
the coffee?