The Day the Mesozoic Died: The Asteroid That Killed the Dinosaurs — HHMI BioInteractive Video

Published 2014-08-26
Ever wonder why the dinosaurs disappeared? HHMI BioInteractive investigates the cause of the mass extinction at the end of the Cretaceous period—and the clues come from paleontology, chemistry, physics, and biology.

This three-act film tells the story of the extraordinary detective work that solved one of the greatest scientific mysteries of all time. Explore the fossil evidence of these prehistoric animals, and other organisms that went extinct, through this lively educational video.

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Free teacher resources supporting this short film can be found at

All Comments (21)
  • Hector Diaz
    Wow hats off to this photographer, he really put himself in danger taking all these shots
  • Jerry Ericsson
    I grew up on a farm near the pretty rock hills. Dad once found a huge bone while plowing his field, he brought it home and we kids played with it for years. Dad thought it was a big bison leg bone, but it was petrified. Now I believe it was a dinosaur bone. Wish I had hung onto it, but it probably still lays somewhere on our old farm-site, when we moved from in int 1959 nobody ever moved in to live there, it is now part of a pasture belonging to the neighbor that dad sold out to in 1963.
  • One of the best documentary i have ever watched. It explains in great detail how the whole extinction event of dinosaur unfolded. My respect increases manifold for the scientific community for doing all these research and hard work to excavate the truth.
    This video also makes us realise how insignificant we are in this vast universe. One asteroid or one virus outbreak could wipe us out of this planet just like the dinosaurs.
  • Hello Mateys
    Gotta give it to the animators too, it looks so real. Good job 👍🏻
  • Cindy Ward
    I've often wondered how exactly the remaining animals survived, both during and just after the event. It must have been an extremely hazardous and difficult time.
  • Leigh J
    Man its really crazy to think about how many things that we now know as "common knowledge" used to be entirely unknown, and cutting edge discoveries. I think I've been taking that for granted.
  • Renacimos antes de nacer, gracias a los pequeños animales, en especial, a los mamíferos. Magnífico documental.
  • John Groover
    This is one of the best explanations of the mass extinction of the dinosaurs that I've ever seen. I loved the history portion of the video. My dad showed me the KT boundary when I was a kid and I thought it was pretty cool. It really must have sucked to be alive on that fateful day.

    REMEMBER - Another asteroid is on its way. It's not a matter of IF, it's a matter of WHEN.
  • redstone1999
    This one of the best documentary I have seen on this period of Earth's history. Not dry science, not over dramatized, a very pleasant mix of both.
    Looking forward to the Greenland & Hudson Bay asteroid(s) that ended the last ice age.
  • Christian Perez
    I love videos like these. They bring back memories of when I used to watch documentaries right after school growing up.
  • Chuck Hickl
    This video encapsulates everything that is positive in YouTube. I am well versed in the KT boundary event but have never seen it analyzed in such detail. Great video! Hope you folks with kiddos watch this with them and potentially inspire some new scientists, archaeologist, or any other discipline that might apply.
  • vrj97
    Fantastic video. I love it when we aren't just presented the (awesome) facts but also given a detailed yet accessible explanation of how they were discovered. From the discoveries of those scientists all the way to the making of this video, beautiful, beautiful work.
  • Terrioestreich
    I love how they put together all of the clues from around the world to understand how, when and why the dinosaurs went extinct. It's amazing, thank God for smart people!!
  • John C G
    This kind of archaeological science and the people who study it will never cease to amaze me. Their patience and ability to see past the obvious is boundless. From them we learn so much about our world's past and how we got go be here.
  • How does this channel not have more subscribers?? This was very interesting and very well put together!
  • RagingPeppers
    We’re basically living in a post apocalyptic world
  • Brian Tuk
    Every time I watch a simulation of dinasour extinction, I feel sad about those poor creatures
  • Despond
    Amazing footage, respects to the camera crew that risked their lives to bring us this.
  • Thanks for such a lucid explanation with good graphics. I just wanted more specific dates of discovery. I
    think the NY Times showed the blurry date January 29, 1988. But I'm not sure. I'm surprised at how recent these
    discoveries are. No wonder my old Life books have it wrong. Again, great job! Thanks.
  • The Imp
    This was as good as it gets. Riveting and highly informative and not boring for a second. This is a model for how information of this sort should be disseminated.