See how olive oil and magnets can control the brightness of light via the Faraday effect. Get your iron-on Applied Science logo here: https://www.patreon.com/AppliedScience Measure Verdet constant of olive oil: http://www.sestindia.org/wp-content/uploads/2013/12/Volume-2Number-3PP-362-368.pdf Plastic film polarizers: http://www.apioptics.com/linear-polarizers-spec.html Faraday effect: https://en.wikipedia.org/wiki/Faraday_effect