7. The Universe Death Clock
https://www.youtube.com/watch?v=F1CddzgVW14 Speaking of clocks, heres another one. Well, its actually rather more of a timer than a clock, and its set on a countdown as we speak. What does it count down to? Oh, nothing particularly important only the white-hot death of the entire universe. The setup for this machine is actually fairly straightforward. It consists of pairs of hoppers, each of which have 320 items between them (5 stacks of 64, the maximum possible number a hopper can hold). The pairs of hoppers are set up so that they transfer the items between each other but only when they receive a redstone pulse from the previous pair of hoppers. And that redstone pulse only activates once every last item has been transferred from one hopper to the other. The first pair of hoppers has to be automated, or the whole thing wouldnt work so that first pair takes about 4 minutes to send out a single redstone signal. The second pair takes slightly longer, at around 23 hours per pulse. By pair 4, a single pulse takes 266 YEARS. At pair 7, each signal will occur every 9 billion years. There are 43 pairs of hoppers in this system thats how incredible this machine is. The last pulse, which opens a single, lonely door, will not be seen for a googol years (which is a 1 followed by 100 zeroes) at which point, the last fundamental particles in the universe will have decayed into total nothingness. Entirely pointless but genuinely mind-blowing.