How can scientist figure out the age of a person by looking at their skull

the joints or fontanels between the bones change, becoming smaller with age. If the skeleton has wisdom teeth, the person was past the age of 18. If there is significant bone loss, it indicates a more advanced age.

is this a question or a comment

in this passage from chapter 6 of "animal farm", by george orwell, what the author is ridiculing in this passage is the frivolity of some rules.

clover, the mare, believes she remembers that the fourth commandment forbade sleeping in beds because it was something that humans did. snowball, napoleon, and the pigs are brain-workers who look after the welfare of the farm. they are the obvious leaders because they are smart, and so they are entitled to eat the best food and sleep in beds. it is squealer, who says these lines making the difference between sleeping with sheets, what humans do, and sleeping in beds, what pigs do. the unwillingness to question authority makes the oppressed to obey without thinking.