That's the point of using physical projectiles, not light beams. You watch. That...

		AnimalMuppet on Aug 18, 2015 \| parent \| context \| favorite \| on: What does it take to make Google work at scale? That's the point of using physical projectiles, not light beams. You watch. That's how you know. "Watch" may mean using something like a phased-array radar to measure it more precisely, if you wish...