Have you gone to see The Martian yet? (And if you haven’t, my review of it may help speed you on your way.) Did you love it? Just kidding — of course you did. But did you read the book first? If you did, you may have noticed that a lot of Mark Watney’s hands-on science work didn’t make it into the final cut of the film. Which I can understand, because some people actually don’t want to sit in a theater for four hours watching science projects on the big screen. But a few of these scenes were still shot, the above being one of them shared on Twitter today by The Martian author Andy Weir. Check it out — it’s about an experiment called ChemCam, which is actually a real thing being used on Mars right now by the Curiosity rover!

(This also leads me to believe there will be an extended director’s cut of the film that will some day get released that includes all of the cut scenes in place, especially this one — it is Ridley Scott, after all!)

See more deleted scenes from The Martian on the Ares: live YouTube channel.