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hey, vsauce. michael here.in 2003, researchers did the measurements and found that kansas is in fact literallyflatter than a pancake. of course, the earth is not flat, the earthis round. otherwise travellers would be falling offthe edge all the time. right? wrong. if the earth was not a ball shaped, but wasinstead a flat disk, like this plate, well with the weight, density and thickness, livingin the middle could feel pretty normal. but as you move toward the edge, gravity on a disk earth would slightly skew, pushing
at a greater and greater angle back toward the centre. my friend nick from 'yeti dynamics' put togetherthis great simulation. the person and buildings obviously aren'tto scale but check out how such increasingly diagonal gravity would work.although this is a flat disk, it would feel to a runner headed toward the edge, like they were fighting to climb up a steeper and steeper hill. the building foundations behind the runner reflect how you would have to build structures, closer and closer to the edge, so that people living in them always felt like down was atright angles to the floor - the way we feel
it on our big, round earth.as you approach the edge, things would get scary. remember, this is a flat earth, but it would feel like a sheer drop off. what's really cool is that contrary to the "don't fall off the edge" fear, on a flatworld because of gravity, the scary risk would actually be falling away from the edge androlling all the way back to the centre. once you stepped over the edge, instead offalling off into space, you'd be able to relax. it would be a nice level place.
this model, of course, neglects the fact that such a planet shape would be impossible. anything as massive as the earth, shaped like a flat disc, would, under its own gravity,naturally collapse back into a ball. this is why in outer space everything morethan few hundred miles in diameter is round. or so we've been told.what if gravity isn't real? what if the earth is, in fact, flat and sciencehas been wrong all along? it's a misconception that christopher columbusdiscovered that the earth is round. virtually every scholar and major religionin the west accepted earth's rotundity, since
at least the time of the ancient greeks, who,for instance, had noticed that boats disappear bottom first when sailing away.and, as you walk north and south, stars pop in and out of the view. the misconception that only a few hundred years ago lots and lots of people believedthe earth was flat likely began in the modern era, as a sort of insult.well, your people recently thought the earth was flat, so why should we believe you now?the smear was repeated and published so often it became accepted as historical fact."flat-earther" became synonymous with "anti-science". it might seem flat over short distances, butover longer ones, well the earth is pretty
darn curvy. the verrazano–narrows bridge, connecting staten island and brooklyn, had to be designedwith earth's roundness in mind. its 2 towers, separated by 1300 metres, andperfectly vertical, are nonetheless 41 milimetres further apart at the top than at the bottom because of earth's curvature. in the 3rd century bc, eratosthenes measuredthe differences between shadows cast by poles in syene and alexandria to calculate, morethan 2000 years before rockets and space travel, the circumference of the entire globular earth,with, for the time, impressive accuracy.
word got around that the earth was a roundshape after that. but in 1906, wilbur glenn voliva became headof a slightly bizarre religious sect that pretty much ran the city of zion, illinois. voliva believed that the earth was actually flat and he enforced flat earth's teachingsin schools in zion. he also enforced that belief on really anyonewho entered the city. voliva believed not only that the earth wasflat, but that the sun was only few thousand miles away from earth.not 93 million. he also believed that the sun was only 32miles across, not 860 000.
he sounds crazy, or does he?you see, the same phenomenon eratosthenes measured could be explained by a flat earth,if the sun were only few thousand miles away and 32 miles across - the math would workout the same. today, with the power of the internet, modernday flat earthers have picked up where voliva left off. they have quite good explanations for any evidence you throw at them that the earth is round. circumnavigation is really just a flat circle path. the round shadow earth casts on the moon duringa lunar eclipse could also be made by a flat
disc.time zones are caused by spotlight sun, and remember how gravity would be totally differenton a disc-shaped planet? well, they argue that gravity, as we knowit, simply doesn't exist. the flat disc of earth is merely acceleratingup at 9.8 metres per second. as for all of the photos and video evidencewe now have that the earth is round, thanks to space exploration, well all of that materialis completely fabricated. a hoax, perpetrated by big globe.space agencies, airlines, globe manufacturers. they are reaping the rewards of our ignorantbelief that the earth is actually round. they know, of course, that it's flat.and they're hiding that truth from us.
is it merely a coincidence that the logo usedby the flat earth society is a projection of earth, centred on the north pole, and alsohappens to be the projection used by the united nations? are these people for real? probably not most of them.but this is the crocks of poe's law. an adage that states that at their extremes,parody of extremism and sincere extremism are difficult to distinguish. although clever, flat earth theories are predominantly ad hoc explanations - excuses made up on thespot that only address one issue and don't
fit all the evidence. science, of course, rejects a theory if a better one fits more of our observations,but why the egoistical obsession with our observations? a cosmic ray particle could use the very same scientific method we use and conclude thatthe earth was, in fact, flat. you see, at speeds near the speeds of light,time slows down and lengths contract. one way we know this is that unstable muons,created in the upper atmosphere by the collision of cosmic rays with the atmosphere, shouldmostly decay before reaching earth's surface.
but yet, we detect a lot of them down here,because they're crazy fast speed literally means that, from our perspective, their physicsruns according to a slower clock; and to them, the distance they have to cover to the surfaceduring their short lives is, from their perspective, much much shorter than it appears to us.if you're a cosmic ray proton travelling at 99.9999999999991% the speed of light, earthwould appear to be only 17 metres thick in the direction you travel. so earth is flat to them, but round to us. it is ball shaped to some observers and flat to others. there doesn't appear to be a single most correct-est,in all circumstances, answer.
susan haack compares knowledge to a crossword puzzle. new answers interweave with old ones, theyall reinforce one another. the clues are the questions we ask, and theway the answers fall into a predetermined grid, well, that's our confidence that we'reon the right track. but that doesn't mean one day there will bea finished puzzle - a complete answer. recall the new york times famous 1996 crosswordpuzzle that came out the day before the us election between bill clinton and bob dole.the clue for 39 across was pretty crazy. you seemed to need to be able to tell thefuture to answer it correctly. it simply said,
"lead story in tomorrow's newspaper (blank) elected". well that blank could be clinton or bob doleand who's to say which one until tomorrow? there's no way to know.but, as it turned out, the answer was clinton, or bob dole.no matter which you wrote in, all the other clues fit.for instance, a "black halloween animal" could either be a cat or a bat. our knowledge about the outside world might be the same.
a puzzle with no answer key, just the reassurance that the answers we think we know fit together,so they're probably correct. though there's always the possibility thatthe answer to one clue, or all of them, will fundamentally not have a single definite satisfying answer. the puzzle may be playable forever. i like what richard feynman says about this. "some people say 'how can you live withoutknowing?' i do not know what they mean. i always live without knowing - that is easy.how you get to know is what i want to know." you know?
and as always, thanks for watching.
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