Gravity is no more and no less relentless than other forces. No one can make a boulder lose its gravity, but also no one can make the electron lose its electric charge or electric current - its magnetic field. We manage the electric and magnetic fields, moving the particles that create them; we can control gravitational fields similarly, by moving ordinary masses. It seems that we can not learn the secret of gravity control because we have already done so. A child with a small magnet can lift a nail, using a magnetic field, chtobypreodolet Earth's gravitational attraction. But unfortunately for eager engineers working with gravity, the use of gravity to lift a nail requires a tremendous mass. If you have straight, Venus will be in over your head - it almost does what you need, as long as it does not fall on you.
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