Based on the clue 'a watched pot never does this', what is the answer?

Based on the clue 'a washington dc hospital bears the name of this ma...', what is the answer? What is associated with: a watch brand introduced in the 1950s with tv torture tests? Based on the clue 'a watchdog really uses its hearing dogs hear freq...', what is the answer? What is referred to by 'a watched pnb'? Based on the clue 'a watchtower distributors relocation service provi...', what is the answer? Based on the clue 'a water bird related to seagulls we hope you dont ...', what is the answer? Based on the clue 'a water filled barrier around a castle', what is the answer? Based on the clue 'a water snail has these at the base of its tentacl...', what is the answer?