http://www.scientificamerican.com/video/why-do-we-love-chocolate/

http://www.scientificamerican.com/video/why-do-onions-make-us-cry/

http://www.scientificamerican.com/video/grass-sacrifices-itself-for-humans/

http://www.scientificamerican.com/video/dogs-understand-human-emotion-says-study/

http://www.scientificamerican.com/video/how-the-zebra-got-its-stripes/