5 surprising mistakes women make that can cause hair loss
To keep the hair in place many opt for a ponytail, a bun, or a very tight braid however, it affects the traction alopecia ...
BBC15 小时
The human reproductive system
Most girls begin puberty between ages 8 and 14, with an average of 11. Girls develop more quickly than boys and most finish puberty within four years. Most boys begin puberty between ages 9 and 14 ...