Avi Loeb, the head of Harvard University's astronomy department, believes that it is arrogant to assume we are alone in the universe. Read the article "We Are Not Alone in the Universe, a Harvard Astronomer Insists." Look for our 5 signposts along the way! After you've read, tell us what signposts you've noticed! Find and share at least 4. Give 1 example of each signpost you see by copying and pasting a sentence from the text in your discussion post. Then, explain how that sentence made you think of the signpost!