From PBS: HOW SHERLOCK CHANGED THE WORLD, a new show about the world's most legendary fictional detective, reveals the astonishing impact Holmes has had on the development of real criminal investigation and forensic techniques. From blood to ballistics, from fingerprints to footprints, Sherlock Holmes was 120 years ahead of his time, protecting crime scenes from contamination, looking for minute traces of evidence and searching for what the eye couldn't see.