25 Science Facts That Will Blow Your Mind

5. Too much silver can turn skin blue – Argyria is a condition in which skin turns a blue-grey shade, provoked by ingesting silver. Broken down in the stomach, silver enters the bloodstream as a salt and is deposited in the skin. Light oxidises it, producing blue or grey-silver compounds. Sufferers have usually taken colloidal silver supplements – an alternative remedy with no known benefits.