The new "Jurassic Park" movie, "Jurassic World," opens today, and spoiler alert: It's about dinosaurs brought back to life by scientists. Here's the trailer if you haven't seen it:
It looks very exciting, but it still raises the same question as the first Jurassic Park: Can scientists really bring back dinosaurs?
The answer, not surprisingly, is "no." Even in a perfectly preserved state, DNA only lasts 6.8 million years. However, that doesn't mean we can't bring back other extinct creatures, and scientists are working on it right now.