Henry Reich of MinutePhysics (http://www.youtube.com/minutephysics) joins the show to talk about fluorescence and then Jessi from Animal Wonders (http://www.youtube.com/user/Anmlwndrs) shows up with her Half-moon Conure Loulou.
Link to the 2nd video where Henry explains it all: http://youtu.be/MU-ozeIrfmw
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