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.
Total length: 48,000 kms. The Pan-American Highway is the world's longest âmotorable road,â according to Guinness Book of World Records. The Highway links almost all nations in North and South America except for a stretch of 100 km called the Darien Gap, a forest and swampland. Click NEXT to read more...