The abacus is believed to have been developed in the ancient Near East in the third millennium BCE. An abacus consists of a series of thin parallel bars set into a rectangular frame, usually made of wood. Each bar contains a number of beads that slide along its length. Individuals use the beads as number counters and use the abacus to perform addition, subtraction, multiplication, and division.
How to Hit Puberty Faster. Puberty is that time of life when a childâs body matures into the body of an adult. Puberty for boys starts usually between the ages of 9 and 14 years old. The symptoms of puberty in boys include enlargement of testicles and penis, growth of underarm hair, facial and pubic hair, deepening of voices and a growth spurt.
1 Some boys start puberty earlier then 9 and some start late then 14. 2  If you haven't started puberty, there is nothing to worry about, it will happen. 3  If you have questions regarding puberty, ask your parents about it or talk to a doctor. Every boy is different. 2  You might have been crushing on girls for years before you hit puberty, or you may be in the throes of puberty without feeling much interest in the opposite sex. 3  This will come. 4  Of course, if you're homosexual, then your feelings of attraction and arousal may be directed toward other boys or men.