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To escape to South America - that's what pensioner Carl Fredrickson wants to do in the animated film "Up". To do this, he hangs a few thousand helium balloons on his house, with which he takes off and flies through the air. It looks cool, but would it work in real life? And if so, how many balloons would have to be attached to his house? Jack and his physicist friend Dr. Henry Holland-Moritz from the Ernst Abbe University (▸ https://www.eah-jena.de) do the math for you and also explain what dog GIFs have to do with buoyancy. #up #disneypixar #mdrwissen Sources, background information and further information about this episode: More about buoyancy and why helium balloons rise: ▸ https://www.lernhelfer.de/schuelerlex... ▸ https://science.howstuffworks.com/hel... The interview in which the makers of the film reveal the number of balloons they used: ▸ http://www.pixartalk.com/feature-film... If you're wondering how high Mr. Fredrickson would actually get - here's the answer: ▸ https://www.sciencefocus.com/science/... The real-life experiment by National Geographic that even made it into the Guinness Book of Records: ▸ • 'Balloon House' How Hard Can It Be?... ▸ https://www.guinnessworldrecords.com/... Want to make your own "Up" house? You can find the print template and instructions here: ▸ http://peachbum.blogspot.com/2014/03/... There are even more reality checks in our "Science vs. Fiction" playlist: ▸ • Science vs. Fiction with Jack Pop - al... Also check out the videos from the Ernst Abbe University, our physics headquarters: ▸ / fachhochschulejena /-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/ Does radioactivity give you superpowers? How does Sonic reach the speed of sound? How many helium balloons does the Disney house need to take off from "above"? We'll do the math and try it out - with live experiments, smart experts and you. Tell us what we should check and you'll get nerd facts and bragging knowledge for the next party. MDR knowledge on the internet: ▸ https://www.mdr.de/wissen/index.html Please observe our netiquette when commenting! ▸ https://www.mdr.de/s/wissennetiquette