CDC and NIOSH guide offers advice for preventing nail-gun injuries on the job. CDC and NIOSH are bridging the safety gap with Nail Gun Safety: A Guide for Construction Contractors. Related Links: NIOSH Nail Gun Safety Guide at CDC Website Nail guns are favored for their efficiency and convenience, but they're also sending users to the emergency room. According to the U.S. Centers for Disease Control and Prevention, 37,000 people each year are treated for nail-gun injuries, with foot and hand punctures being the most common. A study of residential carpenters in St. Louis found that two of every five
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.