Why cant there be cars powered by grass?

Overunity is the answer ... to make something that breaks newtons laws , ohms laws and a whole lot of smart head laws before our time is something worth marveling about , We are using ancient technology to power our life because we accept that their laws are the only laws there are in physics and most universities defend this fact . But the truth is , that physics can be bent and broken and new ideas , beyond our own comprehension could be discovered. Why believe that matter cannot be created or destroyed except in a radioactive reaction.If there is one exception there must be tons of other exceptions to follow. Our human race is getting dumber every year because of the internet and modernization , not many people want to experiment and discover , they just want to redesign the wheel and brand it with their own name. No offense , but bio-fuels have been done and can be done on anything that is organic , since the decomposition of organic matter releases energy , so it's just a matter of finding the most efficient biofule to produce a lot of energy for the shortest time , Biofules are also a good way to degrade the environment further , whichever way you look at it. To set you on the right path ... you should focus more on invisibe energy , like magnetism or natural radiation from the sun or even earth potential (earth batteries) , they use kinetic and radiant energy which ofcourse if harnessed well can illuminate your life for a long time ... This subject is very wide and i don't want to dictate what someone should think , but atleast try and be more creative and think outside the box. This compter I am using is powered by a Bedini motor , it took me a while to reach suffiient current levels since voltage alone wont do the work on digital , the rectification circuits etc all i did from online designs and I love my small quiet self sustaining generator. Bye ... happy experimenting.

Please forgive me if I am wrong, but what I understood is that zero point energy is the minimum energy below which a thermodynamic system can never go. If we want to extract energy from a system which is at its zero point energy, we need to convert it to a state which is having energy lower than its zero point energy, which is never possible unless we convert the system to a different form in which the system has a lower zero point energy. For example if we want to extract energy from helium at its zero point energy, we have to convert it to some other element with a lower zero point energy. This process, even if possible, cannot produce free energy since helium will eventually get depleted. Extraction of free energy from a system at zero point energy is possible only if zero point energy is infinite, because reducing a finite amount from infinity will not change its value. If the zero point energy of helium is infinite then we can extract free energy from it with out converting it to another element. But experiments show that zero point energy is not infinite. Perhaps this may be the reason why no devise claimed to operate using zero point energy has been demonstrated to operate as claimed.