Related links, references, transcript, credits: www.learningnerd.com/math-in-the-brain-number-sense/ Test your number sense, too: www.panamath.org/ I'm very curious to know if anyone else got an unexpected result! Media credits: - "Gallon of marbles" by Rex Hammock - Photo of thermometer by OliBac on Flickr - Photo of rock pile by Pascal Blachier - "Shiro Kuro (2008)" by Sk'p on SoundCloud.com soundcloud.com/skiponline/shiro-kuro-2008 - What Makes a Genius? from BBC Horizon, hosted by Marcus du Sautoy www.bbc.co.uk/programmes/b00qzlbv www.youtube.com/watch?v=EjDf3-Et-4o&t=11m21s - Video game sound effect by HardPCM on FreeSound.org - "James Mireau -- Gary's Netbook" by chipsounds on SoundCloud.com soundcloud.com/chipsounds/james-mireau-garys-netbook All references, credits are at www.learningnerd.com/math-in-the-brain-number-sense/