The section "Quick mental arithmetic" has been added
The "Quick mental arithmetic" block holds a great many techniques that will let you learn to count in your head faster and more accurately.
Miscellaneous
Articles that could not be assigned to any branch of physics: too short, too general, or not about physics at all.
Material on this topic
Useful physics programs
A new section has appeared on the site - "Computer programs for physics" - in which small programs can be downloaded that make physics calculations easier.
Online testing in physics
Preparing for the Unified State Examination will now be easier!
The section "The technique of quick mental arithmetic" is finished
The following techniques are gathered in the section on quick arithmetic: - simplifying addition and subtraction - simplifying multiplication and division - methods that take account of the particular features of numbers…
Home mini power stations
Scientists from Cambridge, led by Erwin Reisner, state that in only a couple of decades everyone will have their own mini power station in their flat, able to produce electrical energy and even fuel for a car out of only…
The riddle of old people's memory
Have you ever wondered why older people need more time to remember something?