How do you make a chain saw bike like the one on the gadget show?

good bike gadgets image

Patronum

I saw a chainsaw powered bike on the gadget show and it went really fast how do you make it

Answer
you should search it on youtube to find your ans.

Gadget for the blind to alert them if they is too near something?

Dark A

I would like to know if there are any gadgets out there that alerts the blind if they are too close to something.

I know this is the function of the white stick that they use. However, if such a gadget is created, what are the uses of it (in comparison to the white stick)?

So two questions:
1. Is there such a gadget?
2. What are they uses of it?

Answer
I did see a show once and they had a clicking device and they used it as a echolocation device. On the show they had a few blind people demonstrate that they could ride a bike. You may be able to look that up.

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