Medications, small amounts of chemicals, and other tiny quantities are measured in milligrams.

A tiny little bit of energy drink will not kill a rat as they have similar bodies to humans. They are able to consume a majority of the same foods as people but at much lower quantities.

A tiny drop of yellow or for a warmer cream a small drop of orange. Start with very small quantities first.

Base quantities are the quantities on the basis of which other quantities are expressed. The quantities that are expressed in terms of base quantaties are called derived quantities.

Nope, false. It's safe to have a tattoo and having an MRI.

The Ink does contain some metal but in tiny quantities so it's safe.