Ag Progress Days- Penn State University

Ag Progress is a winner-it's big, fun, interesting and free. You'll see all kinds of outdoor equipment- from small chain saws to giant threshing machines complete with demonstrations.
New innovations abound-like bedding cattle on beach sand and then washing the "used" sand and re-using it over and over.
Another company makes water troughs and snow plows from giant discarded tires.
One interesting and innovative machine makes its own gravel road. It grinds large rocks and deposits crushed rocks behind-making a gravel road as it moves.