At 11:35 AM 11/22/01 -0800, John Young wrote: Do caves >serve as acoustic resonators to emit recorded whispers up >ventilating shafts?
Their waveguide, not resonance, properties might be of interest, if their CO2 emissions -whether speaking or silent- were not so telling. Unless Osama's got a *bunch* of lime. Thermal sig is telling too. They don't grow weed under lights in the karez, do they?
