Is it actually possible to build a time machine? Or how about living forever? Watch Dr Josie Peters take on the world's most puzzling science theories in the full series of 'Weird Science'... Best of Earth Science: http://bit.ly/EarthLabOriginals Best of BBC Earth: http://bit.ly/TheBestOfBBCEarthVideos #WeirdScience #Compilation This is a channel from BBC Studios who help fund new BBC programmes. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx