Dark Matter. How does it differ from Dark Energy? What role has it played in mass extinctions throughout history? To answers those and many, many more questions of cosmological and biological import is Dr. Lisa Randall, one of our nation’s most esteemed physicists and professor at Harvard. Her latest book, Dark Matter and the Dinosaurs: The Astounding Interconnectedness of the Universe, sheds light on some of the greatest mysteries concerning our existence.