Nothing puts a sparkle in a young woman’s eyes like plowing up loads of liquid manure. At least, that would seem to be the case as you watch Carolyn Kokko, a Cornell University graduate student, cheerfully driving a Bobcat utility tractor and using its scoop attachment to muck out lanes between rows of cow stalls in the school’s new Teaching Dairy Barn. More important, the building’s residents seem quite content, too. When the barn was devised, “cow
