"Eventually you reach a high performance level as each time you trace a word, the pattern will start to be remembered, " said Dr Zhai.
BBC: The software is based on pattern recognition
Instead of tapping out letters or writing a word on screen, you trace each letter in a single, fluid stroke.
An etymologist can trace the origin and development of a word, but who can identify the moment when absolutely took off?
CNN: The words you love to hate
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