In 1969, when mankind landed on the moon, many people expected 2001 will be space odyssey, but we know it’s far future. AI is same.
All human did is just to put deep stack of artificial neural network and train the network with labeled data. voila! speech recognition and image classification works much better than traditional alogorithm for some reasons. That’s all. If you are interested in, study Coursera machine learning, Udacity Deep learning, Stanford Conv image net and Natural language process classes. It’s easier compared to rocket science, machanical engineering or graduated-level Physics. There is not any magic.
We don’t have any clue how AGI can be implemented like we don’t have any clue how interstellar spaceship can be implemented.