According to one version, the beginning of its existence can be considered the invention of an abacus of Chinese origin (suanpan) more than 5 thousand years ago. There is a legend that the invention of the abacus was first inspired by hunters. They had to count their loot, so they started setting pieces of wood on sticks. Thus, the great-great-grandfather of the first abacus appeared. Continue reading “Mental arithmetic history”
As mnemonics develops memory and intelligence in general
According to research, people remember only:
10 % of what they read;
20 % of what they hear;
30 % of what they see;
50% of what they see and hear at the same time;
70 % of what they say. Continue reading “As mnemonics develops memory and intelligence in general”