Every so often we get requests for engineering projects to work on. One common theme that I've seen is Kickstarter / Indiegogo campaigns for novelty bicycles to solve that last mile problem in urban transportation: The first time I saw the Kiffy I thought that was quite a cool design. Designed in France it answered the urban dwellers problem of getting places quickly without the hassle of a car and bringing home the groceries. However I think it is now defunct: Some of these others are interesting too: I especially liked the Kiffy because of the three wheel balanced design and the frontend luggage feature but it was just too pricey. I also liked the banking capability. I have a Dahon folder that's nice for 10 to 20 mile jaunts. Some other interesting transportation modes are the Trikke: https://www.trikke.com/ It looks so easy, but I can tell you I had a lot of trouble in slight hills. I understood that former President Jimmy Carter and his wife would go riding on these. I had wished I got the motor assist. In truth it does give you an upper body workout. http://www.bbc.com/autos/story/20150514-the-10-most-beautiful-bicycles-of-2015 The one that caught my eye here was the half-bike, but I started to remind myself that I'm too old to do without a seat. There are still many other designs that I've seen and a book I got that's somewhat dated that I can't find on Amazon. However, I did find these: https://www.amazon.com/dp/1452101671 https://www.amazon.com/History-Cycling-Fifty-Bikes-Velocipede/dp/1623361311 https://www.amazon.com/Bicycle-Definitive-Visual-History-DK/dp/1465443932 If anyone has some interesting bike designs or ideas we can share them here.