1. His scheme for building a perpetual - motion machine is only a pipe dream.

2. His scheme for building a perpetual - motion machine is just a pipe dream.

3. Wasting Time Constructively, is an amazing story of a perpetual motion machine named Peter Solomon

4. Charles Redheffer was an American inventor who claimed to have invented a perpetual motion machine.

5. As operating devices , perpetual - motion machines are the province of crackpot science and science fiction.

6. Mr Kaku identifies just perpetual - motion machines and clairvoyance as being truly beyond the realm of possibility.

7. 17 Within the Boundless, which is in perpetual motion, worlds, including our world, come into being and pass away.

8. In order to escape communist indoctrination classes, he devoted his time to the study of perpetual motion, in 1968 he received personal funds from Zhou Enlai so he could conduct experiments.