When you brake your vehicle there's an awful lot of energy lost. All that forward motion is just stopped and dissipated. Now suppose that the act of stopping was not an act of stopping but really an effort of your motion to compress air. Then - to regain the lost energy the compressed air is released, returning the vehicle to it's original forward movement or at least assisting that action

Here's a big one: Do you have the technical skill or know someone who has? I live in Paris. In the halls of the metro station underground at Duroc station, I was walking behind a hand-in-hand couple who were blind. They talked endlessly and tapped tapped tapped along. The corridor turned off to the left. The couple followed along in the middle, like not even thinking about it - with the curve. How did they know that? Ahh! because they heard it turn. They had not tapped the wall, they...

Lots of old ladies alone in their apartments or houses feel vulnerable and they are. Imagine maybe they could feel more secure if.... On the back of their front foor is a device that - if someone makes a commotion at the door, loud knocking or pushing - triggers a tape recordering of a large dog growling ferociously. Could help, if just outside the door on the porch or the landing there was a pretty large, empty of course, dog food bowl with MAX written on the side.

I used to make furninture I had a modern spray set-up where the fluid was forced out of the carbided nozzle by physical pressure not by air (Lincoln makes this). The spray salesman at the time and me figured that it would be possible to make a slurry of cement and spray that also. Now you construct a large rubber bladder, like the bladder of a football, but this one ten feet around and in a bullet shape about ten foot tall. Then you blow up the bladder and you spray on some cement...

The reservoir in your toilet is much too large for the quantity of water needed to flush out the contents after use. Suppose if everybody put a red brick in the bottom of their reservoir how much water that would save!