Where does gravity come from? How does an object's mass shape the fabric of
spacetime?

gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body. That's what gives you weight.

Every object in the universe pulls on the space around it, drawing the fabric of space-time toward its center. The more massive the object, the more it pulls. ... The physicist John Wheeler captured these odd notions

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

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explanation: bc blah