### period:

Peacetime
* are time periods.
* is the time to pay attention to the new technology of war.

### period:

Prehistory
* Prehistories are time periods.
* begins and ends at different times in different parts of the world.
* is divided into different time periods
  - that which occurred before the appearance of writing
  - the story of human existence before mankind had written records in history
* is the time before the invention of a recordable language
* literally means before writing.
* means history of a time before any written record
  - pre-writing
+ History of China, Prehistory
  * Prehistory means history of a time before any written record. In such cases, it is very difficult to tell anything definite about the prehistory of China or any other country. Even then, historians believe some facts about the China of that period. By 5000 BC, people had learnt farming. They had started cultivating millet a type of grain and possibly some more types of grains. By 2500 BC, Bronze Age has come to China.

### period:

Puberty
* Most puberty is part of adolescence.
* arrives about two years later in boys than in girls.
* begins at the usual time and results in a normal size penis, but the testes are small
  - because male and female hormones are released into the bloodstream
  - earlier than most parents and many health professionals realize
* brings changes to their sleep-wake cycle.
* can be a scary time for kids
  - time of poor body image
  - incomplete or delayed
  - overwhelming for teens
  - tough on kids
  - cause temporary excess shedding during the teen years
  - start at an early age and progress at a very slow rate
* causes some insulin resistance because of the hormones.
* does appear to be a factor in higher blood sugars and increased insulin needs.
* ends when an adolescent is sexually mature.
* improves asthma.
* involves a growth spurt along with sexual development
  - the increased secretion of several hormones
* is also a RITE of passage
  - much easier to go through if the tonsils are still intact
* is also the period when some guys begin questioning their sexual orientation
  - time that girls have their first period
  - biological processes
  - earlier and earlier, perhaps because of nutrition
  - more closely related to body weight than to age
  - often the cause of a hormonal surge
  - when people change from childhood to adulthood
* leads to adolescence
  - hormonal and sexual changes
* occurs gradually over several years
  - in most horses during their yearling year
* refers to the age in years of the onset of puberty.
* refers to the physical changes that alter a child's body into a reproductive adult's body
  - occur during adolescence
* resets adolescents' biological clocks to favor later bedtimes and wake-up times.
* stage in life when physical changes happen allowing the individual to reproduce.
* tends to begin earlier in females, often two years earlier than boys.
* triggers a growth spurt.

### period | puberty:

Early puberty
* can also decrease a girl's ultimate height.
* concern, because it increases the risk of breast cancer later in life.
* is linked to increased risk of breast cancer
  - said to be coming at ever-younger ages

Precocious puberty
* Most precocious puberty is simply early maturation.
* can be Heterosexual or isosexual.
* is nine times more common in girls than in boys
  - the premature development of secondary sexual characteristics
* occurs in some cases
  - patients

Rainy day
* are rare and for the most part the sun shines throughout the year
* can be cold and foggy.
* cause a desire to writes.
* keep crowds low and animals active.