I can measure gravity
i can also measure how many people have been killed by religion. (like Jehovah's witnesses refusing blood transfusions, suicide bombers and the crusades)
Tools of war are not always obvious. The worst weapon is an idea planted in the mind of man. Prejudices can kill, suspicion can destroy, and a thoughtless, frightened search for a scapegoat has an everlasting fallout all of its own.