Misc: What was the age limit when the original seven astronauts were chosen?

Questions

to which us city would you travel to see the liberty bell?

in what us state is fort knox?

what type of metal is used in the filament of an electric light bulb?

how many litres of water vapour can be lost in a large tree in an hour by transpiration?

which company built the first spiral escalator in the 1980's?