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.
Others may feel anxious about the fact that they are starting puberty before or after most of their peers. Boys should be informed that puberty can start at very different ages and progress at different rates. However, if a boy has not started puberty by age 15, he should see a doctor to rule out possible health complications. In addition, boys will also experience an increase in their sex drive once they hit puberty. This results in a number of responses, from developing romantic feelings for someone to having sexual thoughts or impulses. Bottom Line. Boys go through a lot of confusing and startling changes during puberty.