Where is Philosophy, page-56

What is a DL?

Yep seems an interesting read, thanks am digesting it for some other ideas eg ∼20-100 kHz

there is a plant in South Africa that changes it stance when it knows animals are grazing on other ones

think @wafflehead may have mentioned it before

was chatting to a human many moons ago that heard the plants being hurt eg trees being cut down
reckon it was a slighty high pitch wane

yes waves

bit like cavitation