The map above shows incidence of drug crime (darkening shades of green) against locations of nursery schools (red dots). As you can see, the Mayor need not worry about infant crackheads. This and thousands of other comparisons can be made over on MapTube London, a new site from UCL's Centre for Advanced Spatial Analysis. MapTube London allows you add your own maps of the capital, and compare data by overlaying different maps. The perfect......

Look out the window. The clouds you can see are 1059 m up. They’re coming in from the North North-East at a steady 9.3 mph. How do we know this? UCL’s new weather display, which gives fresh data on London’s weather every three seconds. It’s addictive. As well as realtime information, the site also presents graphs and record sheets, so you can track changes over time. The weather centre was installed by the Centre......