Charlie Stross@benbe The numbers in the final screencap are bullshit. Annihilation of 1Kg of matter is equivalent to a 21.5Mt explosion so even total annihilation of the 100g apple and same mass of titanium only yields ~4Mt.
Most likely on contact there'll be an electron/positron reaction: the molecules in the apple will rapidly chemically disintegrate, but the fireball of antimatter surrounded by a titanium plasma will keep the air out as it rises due to convection.
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