It does echo - just very quietly. I know - I've heard them! This has been proved on "MythBusters" and "Braniac: Science Abuse", who both found that, when examined by an audio-expert, the echo was "swallowed" by the original quack, due to the very sim...
edgers, water drainage pumps, chainsaws, weed eaters, rototillers
Edgers have a blade that cuts into the ground next to harder surfaces. The main part of the edger usually has wheels that you keep on the harder surface. Be aware that grass and dirt fly as this is used. Wear safety glasses and cover your skin as fly...