"Martin Rees' What we still dont know - Are we alone? Why are we here? Are we real? <a href=""https://youtu.be/c9y6zE8ZxZs"">https://youtu.be/c9y6zE8ZxZs</a> <a href=""https://youtu.be/oyH2D4-tzfM"">https://youtu.be/oyH2D4-tzfM</a> <a href=""https://youtu.be/Ww-VRIyadBI"">https://youtu.be/Ww-VRIyadBI</a>"