Why is it much safer picking up hot dishes with a dry cloth
than a wet one?

Using a dry tea towel to grab a hot pan puts the heat into the towel fibers, which are poor conductors of heat, and which serve to separate your hand from the hot pan by a set of air gaps.

b.final

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.