I think its for protection. The streets are dangerous and you can't trust anyone. Having dignity makes those around you respect you and it shows those around you that they can count on you. No one is going to go after someone who is well respected because a) they don't want anyone coming after them for going after someone who has a lot of cred and b) they hope that others will show them the same respect back.
The answer is physiological; sympathetic nervous system. The physiological segment of emotion is intricate and includes numerous zones of the cerebrum and the nervous system. A lot of the physiological excitement that we involvement with emotion is an aftereffect of reactions in the autonomic nervous system.
A vase on a table overcomes gravity because of the upwards force of the table against it, which is stronger than the force of gravity. If you were to move the vase off the table it would no longer have anything stopping gravity from breaking it.
Yes because you can use them to colect data and analyze it
