Lenovo on Thursday announced the ThinkPad X131e Chromebook for schools. Aimed at the K-12 market and up, the laptop is ruggedized with a rubber bumper around the top cover and stronger corners for protection in case it is dropped. The hinges and hinge brackets have also been strengthened. The ThinkPad X131e Chromebook will be available to K-12 schools beginning Feb. 26 at $429 through special bid pricing.