Innovators hail the appliance of science

Chinese inventors unveil a wide range of projects, from a walking suitcase to a washing-machine bicycle, at one of the nation's top scientific expos, as Luo Wangshu reports

If you've ever wanted to play the piano but never found time to learn, He Yusha's "piano trainer" may be just the thing. The attachment, which features a computerized tutor, can pare decades of repetitive practice down to less than a quarter of an hour.

"This device can teach anyone, with or without previous experience or the ability to read a score, to play a song in 10 minutes," said He, founder and chief marketing officer of The One Piano Co, which makes the device in Beijing.