The tractor can plow a preprogrammed course, be operated manually or both. When the tractor flashes a blue light and honks in response, a quick shift into drive, and it’s off. Fixing on a screen, it’s ...

At the trendy South by Southwest conference in mid-March, there was buzz about music, movies, President Obama's keynote address... and tractors. Why? Because there's a new, low-cost (but pretty smart) ...