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.
How to Keep Up With Other Guys. Don't stress if you're not in puberty yet. And don't compare yourself to other guys. Instead, do this: Take it in stride. No one always gets what they want exactly when they want it, whether itâs an A on a test or a spot on the sports team, says teen counselor Tina Paone, PhD.Puberty is the same.ere are his top two tips: 1  Get in shape. 2  If youâre overweight or you get out of breath quickly, that might be a bigger issue than not starting puberty yet. 3  Getting in shape can help you keep up with the other guys better.