Among the three-way tie for second place was Amy Martin, from San Francisco.
She said: "Although I got my master's in design and have worked as a designer for years and years, I got my B.S. in Biology so watching your videos helps soothe my professionally-neglected inner science nerd. I actually watch your videos whenever I can (although never at work, no NEVER!) and have been slowly making my way through the periodic table and through Sixty Symbols. Even if I don't win anything, I'll continue to follow your videos... they help me feel smart!"