If you've never seen the rise and fall of humanity as told by a series of pulleys, levers, and CO2 rockets, now's your chance -- a team of Purdue engineers have built a contraption that not only tells the history of the world through the end of days, but is also a contender for the world's largest Rube Goldberg machine. The Purdue team's "Time Machine" catalogs a history of dinosaurs, war, and rock 'n roll before finally culminating in a cataclysmic inferno and efflorescent renewal in 232 steps -- narrowly beating out the previous record of 230 set by Ferris State University in 2010. Impressive, but not officially the "world's largest" just yet-- the team is submitting a video of a flawless run to Guinness World Records to certify the historic thingamajig, hopefully eking out a victory with its two step lead.