This brainy pen detects spelling mistakes
![](https://gkplus.vivavolt.in/wp-content/uploads/2016/02/lernstift.jpg)
A new hi-tech pen named Lernstift has been developed by German scientists. It gently vibrates every time it senses a spelling mistake or sloppy handwriting. It has a special motion sensor and a small battery-powered Linux computer with a WiFi chip.