Overview. If you frequently experience shortness of breath or you hear a whistling or wheezy sound in your chest when you breathe, you may have asthma â a chronic condition that causes inflammation and narrowing of the bronchial tubes, the passageways that allow air to enter and leave the lungs.
1 At 47,958 kilometres (29,800 miles) in total length, the Pan-American Highway is the longest road in the world.  The road starts in Alaska, North America and ends in the lower reaches of South America.
The Pan-American Highway is the longest road in the world. It runs from Fairbanks, Alaska to Buenos Aires, Argentina, stretching 29,800 miles (47,958 km). But it was never completed. A portion called the Darien Gap, mostly jungle about 100 miles (160 km) long located in Panama and Colombia, remains uncompleted.