On 2 November, the US holds midterm elections to Congress. To allow UK readers (in particular) to learn more about what these midterms involve and why they are important, the Guardian has produced a really useful interactive feature.

There are a number of screens that lead the reader through the background information, with the key display showing the US map which lets you hover over each state to discover the situations in each area in terms of the Senate, Governors and House of Representatives.

As I've mentioned before, you should also check out the excellent visualisations and analysis on the FiveThirtyEight blog on the New York Times website for up-to-date statistical forecasts and insights.