From Mail Online:
A pair of German inventors have created a digital pen that can check for spelling mistakes in handwriting.
The Lernstift, which is German for learning pen, has a built-in sensor that recognises writing movements and tracks the shape of the letters to recognise words. It then vibrates when a mistake is made.
Lernstift also has Wi-Fi built-in and the pen can be connected a smartphone or PC to upload written texts online, share them on social networks or take part in writing training.
Link to the rest at Mail Online and thanks to Jeanne for the tip.