Well - part of what they are checking for is that antimatter doesn't experience/produce anti-gravity - since experiments up until the present time have mostly b

Well - part of what they are checking for is that antimatter doesn't experience/produce anti-gravity - since experiments up until the present time have mostly been inconclusive (https://en.wikipedia.org/wiki/Gravitational_interaction_of_antimatter https://en.wikipedia.org/wiki/Gravitational_interaction_of_a...)