• Fact vs. Theory vs. Hypothesis vs. Law… EXPLAINED!
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    Fact vs. Theory vs. Hypothesis vs. Law… EXPLAINED!

    [MUSIC] We need to get something straight. Evolution by natural selection is a theory. So is climate change. But people keep saying that like it’s a bad thing… [MUSIC] I get it, I understand your frustration. We’re all searching for ultimate hashtag #truth, and complex, challenging ideas don’t always fit nice and neatly in our brains. But what is truth? Are there different levels of truth? Are some truths truthier than others? I don’t know. But I do know this: Science is the absolute best tool we have for understanding how the universe works, and theory is not a 4-letter word. If we’re going to trust science together, the least…

  • Will You Still Eat Raw Fish After Watching This Video?
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    Will You Still Eat Raw Fish After Watching This Video?

    Hey smart people, Joe here. What do poke, sushi and sashimi, and all these dishes have in common? They’re delicious. They’re made with raw fish. And they could all give you parasites. Yep. The ocean is a parasite playground. That warning about raw or undercooked fish at the bottom of every menu? It’s there for a reason. At least 15,000 different species of wormy parasites use fish as a host. Raw fish dishes like sashimi are, well… raw. They’re never cooked–which means any parasites or parasite eggs in the fish can end up in our tummies. In case you’re wondering, let me make this next part extra clear for ya:…

  • What is Farthest Away?
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    What is Farthest Away?

    If you’ve ever looked at the night sky, you’ve probably wondered, what’s out there? And how far does it extend? Well … you’re in good company. For thousands of years, humans have been curious about what’s off the edge of the map. Today, science may finally be close to giving us answers to even bigger questions: Does the map even have an edge? And what’s the farthest away anything can be? [OPEN] When humans first started mapping their location in the world around the 6th century BC, the edge of the map was… not very far away. Our earliest world maps showed flat, circular views of the Earth, like you’d…

  • DNA Doesn’t Look Like What You Think!
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    DNA Doesn’t Look Like What You Think!

    [PBS Intro] I hate to tell you this, but if you’ve ever looked at a biology textbook, chances are it was lying to you. Or at least not telling you the whole story– about DNA. Today, we’re going to fix that. [OPEN] Real quick, what image comes to mind when I say “DNA”. Have you got it? You’re probably imagining something like this, or this, or maybe this? That’s not what DNA looks like. Of course you can’t exactly take a photograph of DNA, or see it through your typical microscope. It’s simply too small. A double helix of DNA is just 2 nanometers wide. A DNA strand next to…

  • Why Salt & Pepper?
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    Why Salt & Pepper?

    [Music] They’ve sat with us at nearly every table, a pair that’s partnered most of the meals ever cooked in western kitchens. A Yin and Yang, darkness and light. The importance of salt is crystal clear. Life wouldn’t exist without it and if it did it would taste gross and weird. But out of all the herbs and spices on the culinary roster how did this ground up gray stuff become the go-to spice of life. Seriously, why not salt and turmeric or salt and mustard, salt and cumin, salt and nutmeg, salt and coriander, salt and paprika, salt and cinnamon, salt and allspice, salt and cloves. [Music] Salt, or…

  • Why Do More Species Live Near the Equator?
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    Why Do More Species Live Near the Equator?

    [MUSIC] “This episode is supported by Prudential” Here in Tambopata Peru, EO Wilson once found more species of ant in a single tree than there are in all of the British Isles. Scientists have seen this pattern all over the world. More species exist near the tropics. Why is that? [MUSIC] In one night here in the Peruvian rainforest, I saw more insects in an hour than I’ve seen in my entire life, total. It’s not just insects. Birds, mammals, plants… tropical rainforests are some of the most biodiverse places on Earth. It’s not just the abundance of it, it’s how many different species we find in a given area.…

  • Why Is Blue So Rare In Nature?
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    Why Is Blue So Rare In Nature?

    [PBS Bumper] [OPEN] There are no blue tigers. No blue bats, no blue squirrels, or blue dogs. Even blue whales aren’t that blue. Animals come in pretty much every color, but blue seems to be the rarest. What’s cool, though, is when we do find a blue animal, they’re awesome looking. Nature doesn’t do halfway with blue. To understand why this is, we’re gonna journey through evolution, chemistry, and some very cool physics. But, first we’re gonna need to understand why animals are any color at all, and to do that, we need to go look at some butterflies… because butterflies are awesome… and if you don’t think so, you’re…

  • Is This Why We Haven’t Found Alien Civilizations? | STELLAR
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    Is This Why We Haven’t Found Alien Civilizations? | STELLAR

    Thank you to Draper and its Hack The Moon initiative for supporting PBS Digital Studios. People have always dreamed of ways to be closer to the stars. That’s what brought us here to Mauna Kea in Hawaii. From this spot, we can stand nearer to the sky, and see farther and clearer than almost anywhere else on Earth to wonder what and perhaps even who is out there. On Earth and in space, advanced telescopes have stared for weeks even months into patches of sky and they’ve seen that other stars are surrounded by planets of their own. At least a planet for every star. But what sort of planets…