2015 is theInternational Year of Light , a year destine by the United Nations to value and learn about optic phenomena . To establish their celebrations , thePerimeter Institute for Theoretical Physicsillustrated 20 of their favourite light fact .
hint via thePhysics Today Facebook page . For literally coolheaded optical phenomena , did you get our special on water ice halos ?
https://www.facebook.com/PhysicsToday
https://gizmodo.com/eight-types-of-ice-halos-are-crammed-into-one-glorious-1679103669
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