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.
Growth Spurts in Boys. Growth spurts in boys and girls are very common occurrences as they go through puberty. It has been estimated that young males can grow up to 9 centimeters a year during puberty, and females can grow up to 8 centimeters a year. A teenager will experience the growth spurt and grow to their ultimate adult height. With everything changing in this period, this can be a strange time for young boys and girls. Equipping oneself with the knowledge and understanding of what is happening will help your kids overcome this confusing period.