It's frustrating to hear lex apply so much humanity and human attributes to "aliens" while this guy is trying to be nice and explain why we could have no clue wtf they are, or how they could be around us without us even knowing. How prokaryotes and eukraryotes could have evolved in so many different ways that may be slightly different, but odds are completely different with only DNA and ribosome with ribosome and protein scripting similar. And lex is going on about elephants.