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.
A lot of changes occur during puberty and most are physical. 1  Growth spurts. To begin with, boys begin to have a growth spurts and their bodies start to develop quite fast. 2  Growing pains. Most boys endure growing pains in their legs and arms and this can be an uncomfortable period. 3  Breast changes.