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How Scientists Build Consensus: Crash Course Scientific Thinking #5
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We've known for nearly a hundred years that vitamin C prevents scurvy.
So why can’t I seem to get a straight, once-and-for-all answer on whether
chocolate lowers my risk of cancer?
Or what about coffee?
Or soy?
Or even kale?
These are fair questions.
Maybe you’ve asked one of them before, yourself.
Why does science seem to be so sure about some things but not others?
Hi! I'm Hank Green, and this is Crash Course Scientific Thinking.
I don’t care if it’s good for me.
[THEME MUSIC]
Today, we are going to talk about scientific consensus,
the point when an idea with a strong base of evidence
gains broad acceptance by scientific experts.
It’s how science moves forward!
Consensus is way more than an opinion, or a vibe,
and also a very different thing from just letting your Gen-Z colleague
rename the group chat "meatball zone" because it wasn't worth the fight,
which is a real thing that happened to me.
Scientific consensus happens only when a claim has been run through the gauntlet of skepticism.
Scientists have conducted many, many studies.
They have sifted through the evidence, argued with each other,
tested an idea again and again with different techniques and approaches,
scrutinized studies that others have done,
and reached a point where the evidence backs one explanation as far more likely than any other.
Consensus happens only after an idea has been poked and prodded and tested from many angles.
And getting there isn’t easy.
Building a consensus takes a lot of time and effort.
Think about atoms.
Not those Adams. These atoms.
But of course, I’ve never seen an atom before.
Even the highest resolution picture any human has ever taken of them
just kinda looks like blurry, out-of-focus blobs.
But scientists agree that atoms exist and make up everything because
they’ve worked for centuries, collecting evidence and performing experiments,
to form a consensus around those tiny little building blocks.
To learn more about this, let’s get some Sage Advice!
[funky music]
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