Cloning Dinos from DNA Impossible: The movie Jurassic Park gave us the hope that if we could just find a dinosaur-era mosquito trapped in amber — preferably one that had just snacked on dino blood before meeting its demise — we might be able to extract the DNA from the blood and engineer a "thunder lizard."

Unfortunately, the hope is false. Scientists report in this week's Nature that DNA has a half-life of 521 years. And furthermore, every single nucleotide bond in a DNA strand is broken after 6.8 million years. Since dinosaurs perished 65 million years ago, well….you do the math. Sorry, John Hammond wannabes, a real-life dino park is not in your future.