How do you separate table salt and coffee grounds? (FOR A LAB, NOTHING ELSE IN GLASS CUP BESIDES SALT AND COFFEE GROUNDS) Please help!:)

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands