Step 1 : Introduction to the question "5. In 1984, Alec Jeffreys noticed a difference that changed our perspectives of people. His discovery allowed forensic scientists to solve numerous crimes. Can you find out what this was?"
...1. Dry photographic plate 2. Digital sound recording 3. Digital camera 4. DNA profiling Sir Alec was the first to notice that a tenth of a percent of our DNA was different. He came upon this realization whilst looking at an X-Ray of his laboratory technician's DNA. Since his invention, many rape and murder cases routinely used DNA profiling to identify the perpetrator.
