Any great force can cause a micro tear in the muscles and tendons of the lower back. This injury commonly occurs in sports such as weightlifting, football, basketball, baseball or golf that require pushing or pulling or sudden twisting of the back. The risk of back spasm is greater in people with: 1  A pelvis that tips forward more than normal.  Any back weakness such as arthritis, spondylolysis, spondylolisthesis, disc rupture or a herniated disc, spinal stenosis or a tumor.
The Uniform Time Act of 1966 established a system of uniform (within each time zone) Daylight Saving Time throughout the U.S. and its possessions, exempting only those states in which the legislatures voted to keep the entire state on standard time.
Time Zones. Most countries have signed on to the idea of a standard world time system. For them the world is divided into 24 time zones, and each zone differs by an hour from the time zone next to it. Not everyone uses this system, though.