A penny is made up of metals - copper and zinc both of which have lustrous physical properties
Most juices contain a mild acid. It is the acid tha makes a penny shine.
Acetic acid is the ingredient in vinegar that remove the oxides from pennies and makes them shiny again.
its need of nature which makes sun shine daily
the heat in outer space makes it shine and be hot
I donno. Research it on the internet, dude!!
the sun makes it shine
penny
If you leave a penny in a jar of coca- cola it will clean it shine it up pretty good. I tried this with a really old penny and left it there for a week it looked like new
Reflection of sunlight
My sperm cells
Chrome
a polish is a product that makes things shine.