What is associated with: as early as 1727 johann schulze discovered the light sensitivity of salts of this element but no images were made?

Based on the clue 'as dustin hoffmans friend jeff that is one nutty h...', what is the answer? What is associated with: as dutch guiana until 1948? What is associated with: as dutch leader in 1672 william cut these structures around amsterdam to flood the land foil t… Based on the clue 'as earl of this james brudenell had a sweater name...', what is the answer? What is associated with: as early as 1867 this nyc store with a red star symbol was open until midnight christmas eve? What is associated with: as early as 3000 bc this gemstone was known in china as yu or the royal gem? Based on the clue 'as early as 600 ad monks recorded these on england...', what is the answer? What is associated with: as early as the 1730s cuckoo clocks were made in this woodsy region of southwest germany?