OASDI stands for old age, survivor and disability insurance, which is more commonly referred to as Social Security. To pay for these programs, the federal government imposes a tax on earned income that must be withheld by your employer.
According to the December 1985 issue of Popular Mechanics, the Protex Safety Signal Company introduced flashing turn signals in 1920. The first modern turn signal, though, can be attributed to Edgar A. Walz, Jr. who, in 1925, secured a patent for one and tried to market it to major car manufacturers. They just weren't interested, and the patent expired fourteen years later. Meanwhile drivers and inventors kept working on other solutions.
The electronic traffic light turns 101 on August 5. The first red and green lights were installed in Cleveland, Ohio, on August 5, 1914. The original design, though, came from a Salt Lake City cop named Lester Wire. He came up with the idea in 1912. The momentous occasion of the 101st anniversary of the traffic light is celebrated in the August 5 Google Doodle.