Google’s family of Chrome OS-powered devices has expanded again today with Lenovo’s announcement of the ThinkPad X131e Chromebook, a variant of the existing Windows-powered machine. Pitched by the company exclusively towards the education market, the ThinkPad X131e Chromebook features reinforced hinges and a ‘rugged’ design that is sure to keep it safe around any child, but the 1.77kg machine is not likely to be as child-friendly as the 1.10kg Samsung Series 3 Chromebook, which, like the Lenovo, features an 11.6″ 1366 x 768 matte display and around 6.5 hours of battery, a figure which Lenovo claims should last the entire school day. Unlike the latest Samsung model, however, the X131e sports an as-yet-unspecified Intel processor and is not currently expected to get a wide release. Interested schools will be able to pick them up from February 26th for $429 (£268) with an optional $30 (£19) charge ensuring support from Google. Compared to the $249/£229 Samsung Series 3 Chromebook, the X131e does not look like the best of deals, but a third manufacturer joining the Chrome OS family after the release of the Acer C7 earlier this year only serves as encouragement for the browser-loving among us.