Explore science with TikTok's new fact-checked STEM feed featuring Dr Walt Carroll and Wollongong's Dr Karl. Video supplied as an example of the feed.
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00:00What starts bushfires? While there's plenty of things that can spark a blaze, there is
00:04one thing that starts more bushfires than anything else in Australia.
00:09How does that thing burn when there's no oxygen in space? Short answer is, it's not on fire.
00:16The burning that the sun does is nuclear burning, or nuclear fusion.
00:20G'day, Dr Karl here, and what I have here is the world's first fartograph. What's a
00:26fartograph, you might ask? Well, it's what you get when you allow fart gas to blow onto
00:34a culture plate, and you see what sort of bacteria will grow.
00:37This shark can walk, and poletsharks use their fins like feet, and walk across rocky reefs.
00:47Is human breast milk any different to regular cow's milk? I'm going to compare both under
00:52the microscope. Let's take a look at cow's milk first.
00:56So, by far, my most popular video is the bike wheel. Surprising to me.
01:07So there I was, having my regular bowl of pumpkin soup, and it got me wondering, how
01:12come everybody you know has burnt their mouth on hot soup at least once?
01:17You need to know the law of 37. Here it is. Take any three digit number where all three
01:23digits are the same.
01:24Dinosaurs first started popping up around 250 million years ago.
01:28Most people love drinking out of straws, but how do they work? Most people would think
01:32that when you suck on a straw, you're sucking the liquid into your mouth, but that's not
01:37happening at all. The liquid is actually being pushed into your mouth by the air in the room.
01:43Have you ever wondered why fire retardant is red? The answer's pretty simple.
01:49The hamstrings are located on the back or the posterior aspect of the thigh, and are
01:54actually made up of three individual muscles.
01:57What if we dumped all of our trash into volcanoes? Volcanoes might look like nature's natural
02:04garbage incinerators, but they're actually much more dangerous.
02:06There are red stars and blue stars, orange stars and yellow stars. Why aren't there green
02:13stars? There are no stars that naturally look green because stars emit a wide variety of
02:18colours or a wide variety of wavelengths of light at different amounts depending on
02:23how hot the star is.
02:24Do all sharks need to move to breathe? No. Sharks, like the Port Jackson shark, pump water
02:31across their gills.
02:34Want to create small floating pictures? All you need is a ceramic plate, water and dry
02:38erase markers.
02:40This is how a porcupine can kill you. Let me show you using a porcupine quill and a
02:45microscope.
02:46G'day, Dr Carl here. Now when you put a seashell to your ear, are you actually really truly
02:53hearing the ocean? Sorry to be unromantic, but no. Bummer, man.
02:58How are the names determined for new exoplanets? Great question!
03:02Essentially the way it goes is you have the star name followed by a lowercase letter.
03:07Now the star name tends to be just the catalogue number for the star in the survey that the
03:11exoplanet was found with. So for example, Kepler stars would be Kepler 451 for example.
03:17How to calculate quick percentages part 5. Let's go.
03:20What is 65% of 42?
03:22There is something that lives on this cheese. And to show you, I'll need a few shavings
03:28of the rind and I'll need a microscope.
03:30Can someone please explain to me why we can't microwave metal things? I know we're not
03:35supposed to!
03:36Hank Green is asleep, I hope, so I guess I have to deal with this. Microwaving metal
03:40is usually fine, it's just sometimes not fine.
03:45Microwaves are not magic boxes, they just heat things up by hitting them with light.