http://news.bbc.co.uk/2/hi/science/nature/8147104.stm
'E-Rockit' hits German fast lane
A Berlin inventor has come up with an electric bike which you power by pedalling that can reach speeds of 50 mph.
Stefan Gulas has developed a system that amplifies the effort you put in by a factor of 50, meaning you can accelerate quickly and maintain high speeds with very little effort.
Steve Rosenberg reports.
เจ๋งดีจริง ๆ แต่เห็นว่า ราคาก็แพงเอาเรื่องเหมือนกัน
