Perform Operations on Subgroups of Data - Wolfram Mathematica 8 Document...
When summarizing data, it is often useful to analyze it by subgroup. For example, crop yields could be categorized by seed variety, or avera
Hacking summer school encourages teen startups (Wired UK)
Next Monday sees the launch of Young Rewired State 2011, the week-long multi-site event where under 18s are given the opportunity to build,
Do you really want to be in our tribe? - Telegraph
Explorer Bruce Parry has dined with cannibals in West Papua and become a shaman in Venezuela. Jan Moir meets him.