The 5 most common causes of falling aircraft disaster
Pilot flaws and machine failures are the leading causes of plane crashes, both on terrorism and in bad weather.Dangerous that no one knows because the fault waiting for the train is not correct
Everyone knew that the train had to stop and wait. But it seems we are still too subjective.Determine the identity of a person by ear
Identification can be based on the individual ear shape, more precisely biometric.