How long can Andy keep his boat afloat on a fluidised bed of sand? Aided by a troop of floating objects Andy dusts off the fluidised bed, a classic piece of Ri demonstration kit handed down from the 1950s. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Check our playlist "Tales from the Prep Room" here: https://www.youtube.com/playlist?list... The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter