Most historians agree that the compass has its origins in ancient Chinese lodestones. It was not utilized for sea travel, however, until the Italians unleashed its formidable powers in the twelfth century. Amir D. Aczel, author of The Riddle of the Compass, joins us today on Focus to share the story of navigation through the ages and the impact that the rise of the compass made on history.
Some people continue to worry about both the environmental impact and potential health effects of biotech foods. But are these crops really so different from those we've grown in the past? Will they help us meet the growing demand for food? Today on Focus, we're joined by Professor of Food Science Bruce Chassy to discuss the dafety of bioengineered crops.
Many researchers believe that fuel cells will be the power sources of the future. They are more efficient than the internal combustion engine, have no moving parts, and produce almost no pollution. One day they may power our vehicles, our offices, and even our homes. This morning on Focus we're joined by Scott Barnett from Northwestern University to explore the basics of the fuel cell: how it works and some of its potential applications.