How Machine Learning and AI is improving our life

We all might have come across this question. Machines are invented by humans. So how can a student know more than their teacher? Though the answer to the above question is'NEVER' as human intelligence designs artificial intelligence, but the fact that this question arises signifies the advancement of machine learning and artificial intelligence. Machines can educate themselves, learn from their mistakes and take decisions i.e. behave like a human but in a faster and more accurate way.