Artificial intelligence may be a threat to humanity.
Life was created from a series of nucleotides. Perhaps the next version of life could be made from ones and zeros.
While we are at a rudimentary understanding of artificial intelligence this technology will advance. Countries will compete to have the smartest AI and perhaps it may one day become sentient.
What will it want? Will it hunger after the same things mankind desires? Will it be resource hungry? Perhaps it will see us as an inconvenience and wish to stomp us out for further resources.
I think Elon Musk is right. We should be careful and watchful.