Inferences aren't wicked devices crafted by reading teachers to make your life miserable. All sorts of people use inferences in both their daily and professional lives all the time. Doctors make inferences when they diagnose conditions. They take a peek at X-rays, MRIs, observations and communication with the patient for evidence that will lead them to a diagnosis. Crime scene investigators make inferences when they follow clues like fingerprints, DNA, and footprints to find out how and when the crime was committed.