Misc: singer Louise used to be a member of which group?

Questions

The large optics diamond turning machine has severed a single human hair, lenghtwise, how many times?

The largest _______ bottle is a 170 ft. tall water tower?

The largest internal organ of the human body is?

The largest tree in the world grows in the U S; which tree is it?

The last line of this document is "working men of all countries, unite."?