sweeney sisters medleys always included: "clang clang clang goes --- -------"?

Questions

where would you find the sea of tranquillity?

what is the name given to a chemical that is used when a dye will not fix directly on to the fabric?

in what year was the computer floppy disc introduced?

what are the surnames of the two men who determined the structure of dna?

how many hours are there in a week?