What is the Greek meaning of the word 'electrics'?

If a body is charged by rubbing it,its weight:

How does a simple paper electroscope work?

Consider three point objects $P, Q$ and $R$. $P$ and $Q$ repel each other,while $P$ and $R$ attract. What is the nature of the force between $Q$ and $R$?

What was found by Thales of Miletus?

$(a)$ $A$ comb run through one's dry hair attracts small bits of paper. Why? What happens if the hair is wet or if it is a rainy day? (Remember,a paper does not conduct electricity.)
$(b)$ Ordinary rubber is an insulator. But special rubber tyres of aircraft are made slightly conducting. Why is this necessary?
$(c)$ Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?
$(d)$ $A$ bird perches on a bare high power line,and nothing happens to the bird. $A$ man standing on the ground touches the same line and gets a fatal shock. Why?