The Great Wall of China is a series of stone and earthen fortifications in China, built, rebuilt, and maintained between the 6th century BC and the 16th century. The Great Wall stretches over approximately 6,400 km (4,000 miles). Wall was guarded by more than one million men. The majestic Great Wall was built with wisdom, dedication, blood, sweat and tears. It has been estimated that somewhere in the... 

But do insects have teeth at all?  Yes, a mosquito has.  Have you ever    wondered when a mosquito bit you if it has teeth? Mosquitoes have four knife-like tools of serrated teeth that surround a pair of fine tubes — one for dripping a pain suppressor and one for sucking blood. A common house mosquito stabs the skin with her sharp snout and saws in with her four knife tools to draw blood. She...