Teflon

How One Company Secretly Poisoned The Planet
Veritasium

What does one part per trillion look like? Well, how may molecules of water in an Olympic sized swimming pool? Google tells us:

An Olympic-sized swimming pool contains approximately 2.5 million liters of water. This translates to roughly 660,000 gallons. Since 1 liter of water contains about 3.3 x 10^27 water molecules, an Olympic-sized pool would contain approximately 8.25 x 10^33 water molecules. 

One trillion is 10^12 (10 to the twelfth power), so one-trillionth of an Olympic size swimming pool would be 0.03 cc of water, or 30 cubic millimeters. Not very friggin' much.