: : can anything block gravity?

: nothing blocks gravity unless you believe in anti-gravity.

There has been some controversy over some experimental evidence of super-conductive "shielding" of gravity. The problem is that the experimental results have so far been irreproducible. One such experiment involves spinning a superconductor and suspending it in a uniform magnetic field. the field is then varied and the acceleration of the superconductor measured. The results of one such experiment rotating a type II YCBO superconductor at 5000 rpm was a decrease in the weight by 5%.