Disagree with his analogy on talking to aliens. They may not be able to communicate with us, such as humans trying to communicate with an ant. But, they can still make us aware of their presence, such as we can make a cat or ant aware of our presence and they are smart enough to recognise that.<br><br>The only other explanation would be that they deliberately are not talking to us, because it's boring i.e. we're not that interesting.