Training materials
Authors: Hadley Wickham
and Node: Switzerland
and Contributors: Andrea Argentini or Dr. Simon Tomlinson or Hadley Wickham or John "Scooter" Morris or Marek Vrbacky or Martin Krzywinski or Mateusz Kuzak or Mr. William Edward Hill or Patricia Palagi or Portada: Enrique Sahagún or Prof. Tom Freeman