Would an Antimatter Orange Have Fallen on Newton's Head?

Would an Antimatter Orange Have Fallen on Newton's Head?
Amy Beth Bennett/South Florida Sun-Sentinel via AP

Since Galileo we have understood that in vacuum, a kilogram of feathers always falls at the same speed as a kilogram of lead. Technically, this means that the gravitational mass of an object (that which makes it fall) and its inertial mass (that which makes it resist being put into motion) are identical: this is what is known as the weak equivalence principle.

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