Map showing IPv4 utilization. Lots of unused space considering all the addresses have been assigned. http://internetcensus2012.bitbucket.org/images/hilbert_icmp_map_lowquality.jpg via Christian Neukirchen on twitter
Cool video applying a 24hz sine wave to a water stream. Nice demonstration of aliasing with the camera speed. http://www.thisiscolossal.com/2013/03/this-is-what-happens-when-you-run-water-through-a-24hz-sine-wave/ via #sciencetip on twitter
@aral Does it not show in the box model for you? For me I select inspector tab, select box model on right, click "select with mouse" button on left, and then when I click on an element the box model shows the margin/padding. This is in Firefox 20 beta.