Jacob and Sam play with some lasers to demonstrate that light travels in a straight line and can be reflected by mirrors.<br />Jacob then makes a vortex canon and produces smoke rings which supposedly also travel in a “Straight Line”.<br /><br />Music Credits: <br />"Ouroboros" Kevin MacLeod (incompetech.com) <br /><br />Licensed under Creative Commons: By Attribution 3.0<br /><br /><a href="http://creativecommons.org/licenses/by/3.0/" target="_blank" rel="nofollow">http://creativecommons.org/licenses/by/3.0/</a><br /><br /><br /><br />"River Valley Breakdown" Kevin MacLeod (incompetech.com) <br /><br />Licensed under Creative Commons: By Attribution 3.0<br /><br /><a href="http://creativecommons.org/licenses/by/3.0/" target="_blank" rel="nofollow">http://creativecommons.org/licenses/by/3.0/</a><br />...<br /><a href="https://www.youtube.com/watch?v=yS062y9uEZ8" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=yS062y9uEZ8</a>