From the article: > "Even if you could excite the cup, that doesn't guarantee it would break. Fracture depends on the size of the initial defects." I have to

From the article: > "Even if you could excite the cup, that doesn't guarantee it would break. Fracture depends on the size of the initial defects." I have to wonder if Jaime tapping the glass with a spoon in that video not only reveals the frequency he needs, but more crucially introduces tiny fractures.