I wonder why they cannot use ultrasound or something similar where they &quot;ping&quot; in different locations, then pick up the result by various microphones attached to locations all over the pyramid. I don&#x27;t know a whole lot about this type of engineering so if someone has an answer I would very much appreciate.<p>On another note, if they open it up and find out it&#x27;s been filled with grain this whole time I might have to consider voting for Ben Carson.