Word Origin and History for corrugated Expand. adj. 1620s, wrinkled (of skin, etc.), past participle adjective from corrugate. Meaning bent into curves or folds (of iron, cardboard, etc., for elasticity and strength) is from 1853.
on average girls start puberty between the ages of 9 and 14 but some will start to develop breasts or pubic hair by age 8 and a small number will start to mature before age 7the technical term for this is precocious pubertygirls are five times more likely than boys to develop precocious pubertyn average girls start puberty between the ages of 9 and 14 but some will start to develop breasts or pubic hair by age 8 and a small number will start to mature before age 7
Time Frame. For girls, puberty usually begins somewhere between age 8 and 13. For boys, puberty usually starts anywhere between age 10 and 14. Puberty begins when the pituitary gland--a pea-shaped gland located at the bottom of the brain--releases special hormones that signal the gonads (boys' testes, girls' ovaries) to develop.