medicine: These animals were once used to bleed the sick.?

Questions

Not Telling ;-) Who is Robert Zimmermann?

Not telling ;-P What are these: chrysolite, beryl, jasper, and tourmaline?

Not Telling ;-P What are white dwarfs and red giants?

Nursery Rhymes Jack and Jill went up a ?

Nursery Rhymes Name the nursery rhyme mother whos last name is that of a bird?