There is a normal lordosis in the upper (cervical) spine and the lower (lumbar) spine. People with scoliosis develop additional curves to either side of the body, and the bones of the spine twist on each other, forming a C or an S shape in the spine. Scoliosis is about two times more common in girls than boys. It can be seen at any age, but it is most common in those over about 10 years of age. Scoliosis is hereditary in that people with scoliosis are more likely to have children with scoliosis; however, there is no correlation between the severity of the curves from one generation to the next.
The final rule requires that employers inspect walking-working surfaces regularly and as needed and correct, repair, or guard against hazardous conditions; and Training (Â§1910.30).
Quick Answer. Typically, a coat of polyurethane dries within 24 hours. For example, if polyurethane is applied to hard wood flooring, it is okay for a person to walk on the floor at the 24-hour mark. Oftentimes, a professional places three coats of polyurethane on a hard wood floor. In such cases, 24 hours elapses from the application of one coat to the next. The floor is able to be walked upon at the expiration of 24 hours from the application of the final coat. Provided an appropriate drying period is allowed between coats of polyurethane, the final coat typically dries within a 24-hour time period.