China now boasts seven of the 10 longest bridges in the world, all built within the past decade. Such engineering feats were once mainly the province of the United States, which for much of the latter half of the 20th century boasted most of the longest bridges in the world. Here are the 10 longest bridges in the U.S., and no matter how well traveled you are, four or five of these bridges will come as a surprise.
There are two types of neck braces: soft and rigid. A soft cervical collar is made from thick foam rubber covered in cotton. It is used to support your neck and control pain after an injury (e.g., whiplash).
Type 4: Self-Ligating Braces. Similar to traditional metal and ceramic braces, self-ligating braces make use of the bracket and wire system. This may be the type of braces that most orthodontist use today, but many still use a more traditional system. This type of braces uses brackets with clips or doors that hold on to the wire, instead of the rubber band tie system. These braces are supposed to hold on to less food and be less painful than other types of braces, and they are also supposed to reduce the number of trips to the orthodontist the patient has to make.