Unless you grew up in the US at a particular point in time, you’ve probably never heard of the T-Mobile Sidekick, aka Danger Hiptop. It was designed by a little company called Danger, which was co-founded by Andy Rubin. Rubin would go on to create another company, Android Inc, that started work on a new smartphone operating system before being acquired by Google. Some years after Rubin left Danger, the company was picked up by Microsoft, which was also looking for the next big smartphone OS since Windows Mobile was on its deathbed. The result of was the Kin series, starting with the...