perpetual motion machine

The result would be, of course, a simple perpetual motion machine.

A perpetual motion machine of the first kind produces energy from nothing.

It is thus impossible to create a perpetual motion machine by combining the two processes.

He spent his final years attempting to build a perpetual motion machine.

Now, this is the software engineering equivalent of a perpetual motion machine.

Today, the American tax system can be likened to a perpetual motion machine.

Same as thinking we can have a perpetual motion machine - pure fiction.

To think through if any perpetual motion machine will work, you need to pay attention to the energy requirements in every step of the cycle.

He had a perpetual motion machine which he believed would work.

Nature has given us the perpetual motion machine we call wind.