Apr 28 42 mins. Is any multi-vitamin juice good for you? Does drinking milk gives you acne? Does eating cheese give some people nightmares? Earworms, Christmas Lights and Itches. Apr 21 38 mins. Are dogs mouths cleaner than ours? What are we looking at when we look at a planet? And what is actually going on at 'Magnetic Hill'? Dr Karl answers these questions and more, on triple j mornings with host Abby Butler. The fourth dimension, rogue hairs, wild vegetables.
Apr 14 38 mins. What is a stitch? Why do we grow random long hairs? Can we eat boogers? Apr 07 38 mins. How long could we live without the sun? Why do my veins swell in the heat? When will Mars settlers be called Martians? Nose yoga, ice cubes, time travel. Mar 31 38 mins.
Why don't plastic containers dry properly? Do ball sacks have tastebuds? Why did my glass door explode? Flood water, shopping trollies, cat purring. Mar 24 39 mins. Will Australia be underwater in the future? Could you cook a chicken with body heat? Why are electric kettles so loud? Ducks, body clocks, dinosaurs. Mar 17 38 mins. How does the brain deal with anxiety? Do ducks like the rain?
Could you scream in space? Methane, artificial intelligence, pre-made meals. Mar 10 38 mins. Are there any new deserts? Why does being sick make me feel better? Does Autumn change the worlds oxygen levels? Overnight shifts, spider clouds, spit. Mar 03 40 mins. Do crystals absorb energy? Why does some poop float? Can a broken heart hurt you physically? Electric vehicles, body temperature, mowing. Feb 24 40 mins. Why does anxiety make my hands tingle? Why doesn't corn digest properly? Could we ever shift the axis of the earth?
Public toilets, naked flames, tattoo pain. Feb 17 39 mins. What's the frame rate of our eyes? Does gut bacteria cause depression? What would happen if mosquitos became extinct? Birth control, sea urchins, auras.
Feb 10 40 mins. Does a spoon keep champagne bubbly? Why do I cough when using an earbud? Why do animals sense disasters? Fog, weight training, artificial suns. Feb 03 39 mins. Why don't humans hibernate? What's the best way to hang washing? Why am I attracted to dark haired people? Rusty sunscreen, anti-depressant yawns, road bubbles. Jan 27 34 mins. Could one side of my mouth be dominant? What makes chilis so hot? Why do little bubbles form on the road after rain?
Rainforests, grey hairs, tastebuds. Jan 20 38 mins. Could nightmares be genetic? Why does the weather affect my asthma? Can I outrun a giraffe? Penguins, orgasms, flat earth. Dec 16 41 mins. Is the Earth flat? Why do penguins wobble when they have knees?
What is the biological function of the female orgasm? Space magnets, asteroids, coral sex. Dec 09 37 mins. Do magnets work in outer space? What would happen if you opened a jar from space on Earth? Do germs have the ability to move on their own? Twins, tapeworms, water divining. Dec 02 42 mins. How much force does it take to bite off a finger? Why is salt water so buoyant? Why do I get pleasure from cracking knuckles?
Male nipples, climaxing, wrinkly fingers. Nov 25 37 mins. Do dogs have personalities? Can you compost vegan poop? Why do lizard tails wiggle after falling off?
Eye floaters, rescue bees, drinking blood. Nov 18 37 mins. Why do I always hiccup and burp at the same time? Do birds recognise their own reflection? Why does my dog steal my socks? Nov 11 40 mins. What is Mars's role in Indigenous astronomy? Why are snail trails shiny? How do extinct animals come back? Moles, superstitions, saliva. Nov 04 40 mins. Why can I predict the rain? When's everything going back to normal?
How did we draw maps before satellites? Lactose, acid reflux, plunger coffee. Oct 28 33 mins. Can i change my tastebuds? Can i overcome my food intolerance? Does eating affect my mood? Vacuums, toothbrushes, funny bones. Oct 21 39 mins. How does weather affect our mood? Can a chicken produce a fertile egg without a rooster?
How do some people grow out of their allergies? Heartbeats, pheromones, brain orgasms. Oct 14 43 mins. Why does seeing babies make me want to have babies? Do you start looking like your partner? Can I fall in love via smell? Hydroxychloroquine, contact tracing, vaccines. Oct 07 38 mins. Phantom pain, octopuses, staring. Sep 30 38 mins. Why do we want to squeeze cute things? Do birds feel G-Force when changing direction? Will my semen trigger my partners allergies? Kookaburras, sign language, trypophobia.
Sep 23 40 mins. Should you soap your genitals? Do ducklings ever change their order? Can muscle memory be hereditary? Dr Karl answers these questions and more on triple j Mornings, with host Lucy Smith. Tenet, eyebrows, biotics. Sep 16 38 mins. Which came first; the chicken or the egg? Why does cutting onions make me cry? Does my pee always come out in the same direction? Dr Karl answers these questions and more on triple j Mornings, with host Bryce Mills. Pet psychology, bruises, the sky.
Sep 09 39 mins. Why is the sky Blue? Why do boiled eggs explode in the microwave? Why are some planets called 'Gas Giants'?
Colliding black holes, burritos, birds. Sep 02 38 mins. How do we create blood? Do animals have a sense of humour? Do birds like flying? Comets, coffee, covid. Aug 26 39 mins. Can you catch a ride on a comet? Why does coffee work some mornings and not others? How do trees produce Oxygen? Nosebleeds, yabbies, boiled eggs. Aug 19 39 mins. What's the difference between a virus and bacteria?
Do ants feel hot water? What would happen if everyone started eating a plant based diet? Sunsets, escalators, bees. Aug 12 39 mins. When you lose weight, where does it go? Why does the shower steam when the water isn't boiling? Are bees loyal to one hive?
A legit astronaut joins Dr Karl to answer your questions! Aug 05 36 mins. Time, alchemy, running. Jul 29 38 mins. Has the ocean always been salty? Can we turn lead to gold? Is there any science behind star signs? Spacesuits, dust, 5 second rule. Jul 22 38 mins. Where does dust come from? Have we measured the speed of thought? Is there science behind the 5 second rule? Cheese dreams, choccy milk, body odour. Jul 15 41 mins.
Is choccy milk the best post-workout beverage? Why aren't we disgusted by our own body odour? If someone is blind from birth, can they dream? Chewing, soy, protein. Jul 08 39 mins. Could you last on a deserted island, Tom Hanks style? Are bananas actually healthy? Is my vegetarian diet affecting my PCOS? Period nosebleeds, brains, simulations.
Jul 01 38 mins. What happens if I fall into the deepest hole on earth? How does Dr Karl's brain work? Jun 24 37 mins. Why do I pee more when I'm camping? Do oranges actually help at half-time? Decapitation, shocks, micro-dosing. Jun 17 38 mins. What happens when we run out of oil? How long does the human brain last? How do anaesthetics knock us out? Love at first sight, killer rabbits, pig orgasms. Jun 10 39 mins. Why do dead people still get goosebumps?
What happens if two black holes collide? Why do you feel worse after a long nap? Nail clippings, boobs, spicy food. Jun 03 39 mins. Do you hear the voice in your head or do you think you think it? Sleep-talkers, exploded stars, resistance.
May 27 37 mins. Has the weather been impacted by the Coronavirus? Can you smell when someone is on their period? Crocodiles, beards, indoor plants. May 20 39 mins. Can dogs be left or right handed? Where does the wax go when you burn a candle? How many coffees are too many coffees? Waterbeds, barking, sticky floors. May 13 35 mins. Has evolution made our farts louder?
Do rabbits see colour? How do I survive a plane crash? Meteors, sleep twitching, feeling vibes. May 06 35 mins. Can Wearing a hat make you go bald? Festivals, curves, core-gasms. Apr 29 36 mins. When can we go to music festivals again? Can you store a fart in a jar? Can exercising make you orgasm? Time travel, fart temperature, eating your own hair. Apr 22 38 mins.
Will the bushfires around Chernobyl release nuclear smoke into the air? What is Coronavirus doing for climate change? Why are my farts warm? Hand washing, active cases, hot chooks. Apr 15 37 mins.
How long does an asymptomatic person stay asymptomatic? Should we be worried about the fumes from hand sanitizer? How long can I eat my hot chicken leftovers for? Face masks, dreadlocks, thoughts. Apr 08 36 mins. When should we be using face masks in public? Can Coronavirus be transmitted through animal meat? Vaccines, receipts, 5G. Apr 01 37 mins. Can it live on receipt paper? How do you test a vaccine? Surfing, disinfecting phones, petrol pumps. Mar 25 35 mins. Can you catch the Corona virus from a fart?
What about a petrol pump? What about from surfing? Holding in farts, magnets, face masks. Mar 18 41 mins. Why does drinking red cordial cure my hiccups? Why do I eat more in the winter? Can I touch my face with gloves on? Life on Mars, space welds, menstrual moon cycles. Mar 11 35 mins. Are we still seeing light from The Big Bang? Does space end? Is a earthquake on Mars called a Mars-quake? Panic-buying, human extinction, hand washing. Mar 04 35 mins. What's the science behind all this toilet paper buying bullshit?
Dr Karl answers this question and more on triple j Mornings, with host Lucy Smith. Moon landing, fat birds, brighter LEDs. Feb 26 39 mins. Why don't birds have fat legs? Why are LED lights brighter then ever?
Was the moon landing real? Dr Karl answers these questions and more on triple j Mornings with host Lucy Smith. Protein powder, brain-freeze, carnivore diets. Feb 19 39 mins. Is protein powder a waste of money? Do men poo more then women? Why does my fried keep getting brain-freeze? Boogers, corn, coffee aroma. Feb 12 39 mins. How does a dog recognise the opposite sex if they can't smell their butt?
Is it healthy to eat your own boogers? Plus, is it possible to inter-breed species? Watery eyes, snake venom, coronavirus. Feb 05 36 mins. Do your eyes water when you're getting a wax?
Lunchbox discoveries, Coronavirus, tastebud balls. Jan 29 42 mins. In this episode Dr Karl makes a brand new, ground breaking, mind blowing discovery that has changed his life. Climate change, bushfires, phantom phone vibrations. Jan 22 38 mins. How scientists know what the temperature was in the years before records began?
What role does cattle have on the impact of climate change? And how have the current bushfires affected carbon levels? Jan 15 34 mins. Why do we feel like vomiting after rigorous exercise? Does distance or speed burn more calories?
Plus, the movement of air pollution. Bush life regeneration, fire prevention, benefits of smoke and soil. Jan 08 37 mins. Does smoke benefit the soil? Plus, what can we expect to see in the future for fire prevention? Dec 12 39 mins. Linda Marigliano and Dr Karl take your questions for one last time together. Coconut oil, inhaling smoke, tiredness. Dec 04 38 mins. Coconut oil, inhaling smoke and why you might feel tired when you're doing nothing?
Iced coffee, flies, static electricity. Nov 27 37 mins. Chernobyl Exclusion Zone, what is dark matter and what would happen if flies don't exist? Clitoris, mosquitos, genetics. Nov 20 37 mins. How much information can your brain hold? How do genetics work and does the clitoris have multiple purposes?
Male mammal nipples, music genes, fruit flies. Nov 13 37 mins. Why do male mammals have nipples? Do we have a music taste gene? Plus a fruit fly experiment. Evil crows, bird funerals, swooping magpies. Nov 06 31 mins. Ever wondered whether birds are evil? Plus do birds have funerals like humans do? Exotic animals, unlocking the human brain and sleeping. Oct 30 36 mins. Do you get squeamish at the sight of blood? Plus operating on fish and pollution in your lungs. Oct 23 36 mins.
Why do we float horizontally in water? Why do some adults develop anaphylaxis? Is soda water good for you? Itchy mouths, floating poo and stomach memory. Oct 16 39 mins. Can you overcome gluten intolerance? Is toasted bread good for you? Should your poo sink or float? Floating tanks, day light savings and holding in farts. Oct 09 35 mins. What happens if you microwave a human? Is there anything wetter than water? What are the benefits of floating tanks?
Hungry galaxies, climate change and sleeping with eyes open. Oct 02 37 mins. How will the galaxy Andromeda be feeding on our galaxy The Milky Way? Plus climate change, a positive future and sleeping with your eyes open. Evolving dogs, coffee shakes and webbed toes. Sep 25 36 mins. Have the planets ever lined up in the solar system? Why can some people whistle in tune, but not sing in tune?
Can you water plants using hot water? Rising sea levels, brain's exploding and evolution. Sep 18 38 mins. Is a Googleplex the biggest single number? Are rising sea levels only caused by ice melting? Why do we get blocked noses? Bone density, inflammation and bionic eyes.
Sep 11 36 mins. Why do we have toe nails? Can we dry our clothes by freezing them? Why are sunrises and sunsets different colours? Tongue flaps, pressure points and seal knees.
Sep 04 36 mins. Why do we need to pee when we get into water? How long would humans last on earth if the sun disappeared? Where do false memories come from? Snake bites, popcorn and nuclear devices. Aug 28 36 mins. Why do we get dizzy when we get up really quickly?
Why does hot water sound different to cold water when it comes out of the tap? Why do cold and flu symptoms always feel worse in the morning and at night? Aug 21 33 mins. Why are storm clouds black? How does the burning of the Amazon effect the world? Why are some people more likely to get static shocks than others? Decomposition, rigor mortis and coffins. Aug 14 33 mins. Why do some people get hungry when around a dead body?
Is your brain still active after you die? How long does it take for a body to decompose in a coffin? Bubbles, bushfires and back burning. Aug 07 27 mins. Why do fires burn faster uphill rather than down? Can you cook a chicken by slapping it?
What are the affects of bushfires on trees? Life on another planet, dusk masks and solar sailing. Jul 31 32 mins. How do we better our memories? What do people who were born blind dream about? How much material is used to make one screw? Exploding stars, dark matter and meteor's. Jul 24 37 mins. Can cats land on their feet in space? Why are planets round? What would happen to the earth if the sun moved closer? Swallowing flem, blue light glasses and fruit flies.
Jul 17 33 mins. Why does your dog rub itself in dirt right after you bath it? Do reverse cycle air conditioners have an impact on global warming? Why do you need to pee when it gets cold? Terraforming, moon wind and getting lost in space. Jul 10 37 mins. Are we terraforming the earth? Why was the American Flag flapping in Apollo 11 footage and what would happen if you were lost in space?
Dry hands, nervous weeing and resetting your sense of smell. Jul 03 34 mins. Do you have a fear of belly buttons? Why does your tummy grumble when you're hungry? If human's didn't interact with each other, would we walk like monkeys? Jealously, falling off escalators and wobbly pens.
Jun 26 36 mins. Does fruit taste sweeter in the fridge? Are seagulls telepathic? Can indoor plants help with our air quality? Hungry sneezing, remarkable redheads and the Tay Tay debate. Jun 19 36 mins. What would happen if the whole world farted at once?
Why do we hear our own voice differently to how others hear us? Can you scare someone better? Period syncing, lip fillers and magic mushrooms. Jun 12 34 mins. Why does coffee change taste as it cools down?
Why do we get goosebumps? Do women's periods really sync up? Car napping, stinging pineapple and your IQ. Jun 05 34 mins. Can you change your own genetics? Does cold weather cause you to catch a cold? Why does my head throb when jumping on a trampoline? Generic faces, slushie beers and 5G.
May 29 Does spraying deodorant in your pits effect your health? Why don't I dream? How can I tell if I'm a loud chewer? Sympathy spews, chubby rain and full-moon craziness. May 22 Could you make off milk drinkable by boiling it? Are you heavier after taking a shower? Can computer viruses become real life viruses? Beard hairballs, purring pussies and green boogers. May 15 38 mins. Do bees know they'll die if they sting someone?
Why do I feel hungry after eating fruit? What material makes the best reusable coffee cup? Muscle memory, buttery sweat and our robot overlords. May 08 34 mins. Where does the wind come from? Can we affect other peoples dreams? Why do some people smell like butter when they sweat?
Asapargus wee, sweating underwater and an infinite cycle of yawning. May 01 41 mins. Can we outgrow our allergies? Is it possible to tell if we're sweating underwater? Why does our stomach look much smaller when we wake up in the morning? Hot and cold breath, tilting dog heads and an infuriating itch.
Apr 17 38 mins. Why shouldn't we eat our own poo? Why do bruises change colour? And the lady who literally picked her brain. A whole lotta black holes, rubbish eating volcanoes and weeing in the ocean. Apr 10 39 mins. It's a big black hole celebration! Could one create a new universe?
How can we take a photo of one? What would happen to your body if you entered one? Headphone earwax, poisonous spiders and sticky things.
Apr 03 41 mins. Can different bird species communicate with each other? Why am I so sweaty? Why do animals have an even number of limbs? Hacking driverless cars, killer blackheads and the earth's heartbeat. Mar 27 35 mins. Do dogs have their own personalities? Can I reset myself to become a morning person? Can we use volcanoes to get rid of the worlds rubbish? Submarines in space, lupis and nostril hairs. Mar 20 37 mins. Can animals be allergic to humans? Why do people always go on holidays near water?
Why do I sleep talk? Static shocks, amputees and glow-in-the-dark chicken. Mar 13 37 mins. Why do people have different eye colours? Why don't plastic containers dry properly in the dishwasher? What is glow-in-the dark chicken?
Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings. Red beard hairs, living underwater and movies on airplanes. Mar 06 36 mins. Why do I sweat more on one side?
Can smart watches cause cancer? Why is it easier to see when squinting? Cheek fillers, disappearing allergies and shower stinkies. Feb 27 33 mins. Why do certain sounds give you goosebumps? Can drinking cows milk cause lots of health problems?
Why does your body twitch as you're falling asleep? Chemical happiness, attractive bees and hot feet. Feb 20 38 mins. How do you test sewerage for drugs? Did a hash brownie bring back my sense of smell?
But where does this bottomless blue colour come from? Contrary to what many people believe, the blue colour of the sky is not a reflection of the blue colour of the ocean which covers two-thirds of the planet.
The real answer is that both the sky and the ocean get their blue colour from white sunlight being scattered from the tiny molecules that make up our atmosphere and our oceans. The Really Deep explanation of why the sky is blue is hard. Albert Einstein wrote, in , that Relativity had to be used to fully understand why the sky is blue. It begins with understanding something called "scattering" of light. The light might get changed between being absorbed and emitted, changing in say brightness, or angle at which it is emitted, or even colour.
It was John William Strutt, 3rd Baron Rayleigh, also known as Lord Rayleigh, who looked specifically at light being scattered by very small particles, such as molecules.
Lord Rayleigh was an intellectual heavyweight, winning the Nobel Prize in But it was earlier than that, back in the s, that he gave us the now-famous "Rayleigh Scattering", which explains why the sky is blue.
Molecules of nitrogen and oxygen are a few thousand times smaller than the wavelength of light, so the "Rayleigh Scattering Effect" is definitely happening here. These gases are, in turn, made up of many molecules. These molecules are very small, and very far from each other.
For the incoming sunlight in our atmosphere, it's as though it travels in a vacuum, misses many molecules, and then hits a molecule and gets "scattered". This scattered light then continues travelling in a vacuum until it hits another molecule in our atmosphere.
Each time the light hits a molecule, there's a time delay, during which time the light is absorbed, and then re-emitted. Now here's the essence of Rayleigh Scattering. First, the re-emitted light does not come out of the molecule in the direction from which it came - instead, it comes out mostly at right angles to its original direction.
Second, the "right-angle bending effect" is much stronger for blue light than for red light, so the emitted light is predominately blue. The red light goes mostly straight ahead, and then back out of the atmosphere into deep space - and so you never see it. Third, your eyeball will register seeing a colour only if some light of that colour lands inside your eyeball. So white light will hit a gas molecule, but bluish light will come out - and at right angles to the original direction.
So the light that came from the sun will hit a gas molecule high in the atmosphere, and then will stutter in a zig-zag fashion down towards the ground.
Each time the light hits a molecule, the light comes out mostly at right angles to its previous direction of travel - and each time, it's more blue in colour.
There you have it - the sky is blue is because of Rayleigh Scattering by the nitrogen and oxygen molecules in the atmosphere.
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