It'll Take Him 17 Days To Get To The End Of Minecraft  Thirty
thousand kilometers. That's how far JL2579 has to travel to get
to the edge of Minecraft--more than twice the diameter of Earth.
You can watch him do it live, right here.  Unlike Kurt J. Mac,
who is walking to the end of Minecraft via Let's Play-esque
videos, JL2579 is riding a minecart to the end of Minecraft—and
he's doing it live on Twitch.  Having spent the last hour or so
watching it, it's one of the chillest things I've seen in recent
memory thanks in part to the constant motion, pretty sights, and
good music:  Currently, the cart is traveling at
20m/second—that's why it'll take him 17 days to reach the end of
Minecraft.  Curious as to how he's doing this? From his Twitch's
FAQ page:  I set up command blocks to clone a template bridge
pillar in the spawnchunks in front of the last bridge pier when
a minecart would ride over them. I also added some fancy
overhang and Mountain detection to add tunnel segments when the
track goes through an Extr