If testing a bridge were like software: you would put the 1000kg on it. Repaint the 1000kg barrel red instead of green. And the bridge would fall down. Or it m

If testing a bridge were like software: you would put the 1000kg on it. Repaint the 1000kg barrel red instead of green. And the bridge would fall down. Or it might hold up for every multiple of 1 kg from 0 to 10000 kg, but collapse on 133.7 kg because of some horrible floating-point detail.