Buried "megaripples" — some the size of five-story buildings — are helping scientists piece together the devastation following the impact that wiped out the nonavian dinosaurs.

Find out more about dinosaurs with Andy.

Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window) Click to share on LinkedIn (Opens in new window) Click to share on Telegram (Opens in new window) Click ...

If the link is not working, try using the right mouse button/save link target as... You can only log in once at a time on a download server. If you want to download a ...