Misc: What did early sailors call the islands where cinnamon,cloves and nutmegs were grown?

Questions

on the body what is a calcaneium?

what is the name given to the young of 'dragonflies' and 'damselflies'?

in 1846 american inventor elias howe patented what type of machine?

sea cucumbers are a type of what?

which michael jackson song could have referred to a tennis star?