How do you test sewerage for drugs? Did a hash brownie bring back my sense of smell? Why can't I burp? These science questions get answered this week, by science journo Bianca Nogrady and Uni of Sydney researcher Dr Alice Motion.

Your favourite scientist answers your icy cold questions, live from Casey Research station. With special guests Dr Ben Galton-Fenzi and Casey research station leader Chris MacMillian.

Is brown rice actually better for you than white rice? When you eat ice cream does it leave your body as poo or wee? And how do different foods affect the smelliness of your farts? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Does cement make your nails grow? Are the hiccups hereditary? Why is the sound of a plane flying so loud when you're outside it, but quiet when you're inside it? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Does cement make your nails grow? Are the hiccups hereditary? Why is the sound of a plane flying so loud when you're outside it, but quiet when you're inside it? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

What is traveler's constipation? Why do I have freckles? How do black holes effect dark energy? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Why do I get stitches when I drive a Bobcat? Why do we stick our tongues out when concentrating? Why does black absorb more heat than white. Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Why is the sky blue? Do people age slower in cold climates? Is my water bottle infecting me? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

How do you make the perfect hot chocolate? Does snorting things destroy your sense of smell? What are the particles of atoms made of?

Do you get sicker if you pick your nose? How do you know to breathe? Why doesn't plastic cheese burn?

What causes bags under your eyes? Why does the sound of metal change when it's wet? Does classical music calm children? Dr Karl answers these questions and more, with guest host Karla Ranby on triple j Mornings.

Why do drug addicts like chocolate milk? Does donating blood burn calories? Where did the English language come from?

Comedian, actor and science enthusiast Bill Bailey helps Dr Karl answer these questions and more on triple j Mornings! Why do I get an itchy chin when I have asthma? Should we drive faster or slower when hitting a pothole? Can you develop Stockholm Syndrome for music genres?

Why do you get hungry when you smoke marijuana? Why cant my dog hear my voice over the phone? Why do I burp after I eat an apple.

Have any frozen people been brought back to life? If we eat fish that has eaten plastic, how will that effect us? Why do my eyes keep changing colours?

Special guests Science Journalist Binaca Nogrady and Dr Alice Williamson join Linda Marigliano to answer your science questions.

Why do some farts smell and some don't? What are so many people developing gluten intolerance? Can you ever be 100% healthy with food? In this food and nutrition special, Dr Karl answers these questions and more with special guests dietitian Dr Kyra Sim and USA nutrition expert Yvette d'Entremont.

Do bees know they'll die if they sting you? Why is fire red? Why doesn't our moon rotate? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Is there a set amount of water on planet earth? Why do I get itchy thighs when I exercise? What goes on inside your body when your heart 'beats out of your chest'? Can a loud noise impact the hearing of an unborn child? How long can you go without sex?

Why is the world's population 50% male and 50% female? Is it softer to run on the road or the footpath? How does skin know to grow back?

Is it better to pick up dog poo or let it fertilize? Do we lose our sense of taste as we get older? Why do I get itchy when I sneeze?

Could our universe be a hologram? Can colliding black holes create musical notes? Will our universe collapse in on itself? Dr Karl and Professor Patrick Hayden from Stanford University answers these questions and more.

Can you teach your eyes to roll away from each other? Is it bad to cough on command? How do relaxation pods work? Dr Karl answers these questions and more, with host Linda Marigliano on triple j Mornings.

Are there different species of humans? Is the earth getting heavier? Why can i put my dreams on hold? Dr Karl answers these questions and more, with guest host Karla Ranby on triple j Mornings.

Do cucumbers feel pain? Do mozzies have a purpose in the world? How do you measure a black hole?

Dr Karl is back at it, answering all your science questions on triple j Mornings. Why do noise cancelling headphones cut out on the train? Why don't spiders get stung by wasps? Is eating boogers healthy?

What makes a planet a planet? Why haven't we gone back to the moon? What'll happen to the International space station when we're done with it? Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. Joining her today was Professor Lisa Harvey-Smith, astrophysicist with the CSIRO!…

Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. And joining her today was Professor Clare Collins, Nutritionist at the University of Newcastle.

Dr Karl is away for the month, so science journalist Bianca Nogrady is stepping in to be your science sherpa on triple j. And joining her today was Dr Jess Bloom, astrophysicist from the University of Sydney.

Why do you always see dead cockroaches on their backs? Why is bellybutton fluff always dark blue? And could you get drunk from breast milk if the mother has been drinking?

What's 'visual snow'? Why will a dripping tap wake you up but torrential rain won't? Why do some people wake up grumpy?

How do animals that use echolocation travel in packs without it getting confusing? What's salt and vinegar chip-induced eyelid sweat about? Why do you need to go to the toilet when you get home, but not before?

If you wrapped a wire around the world would you generate electricity? How does my partner make her hands sweat on cue? And if I'm allergic to housecats, would I be allergic to a lion?

Why did salt make my beer explode? Why doesn't your entire body wrinkle when you're in the bath? Why dont dogs poo and pee at the same time?

Why does cheese make you dream funny? Why is my dog's poo growing fungus? Why do I see stars when I sneeze?

What causes a sneezing fit? Would your body dissolve in pineapple juice? Is your sense of smell related to your emotions?

Can maths predict the future? What about lotto numbers? Plus, the question that stumped the nation!

Dr. Karl answers all your science questions, including; is coffee linked to cancer? Is there scientific proof of an afterlife? Why can't we control what we remember?

Dr. Karl answers all your science questions, including; can you skip leg day? Why are deep sea creatures translucent? What happens to your body when you're angry?

Dr. Karl answers all your science questions, including; can you get cold sores from a water cooler? Why do we have fingernails and toenails? Is spinach more nutritious when steamed?

Dr. Karl answers all your science questions, including; what happens during metamorphosis? How high do you have to be to see the curve of the Earth? What's the point of shyness?

Dr. Karl answers all your science questions, including; can you prevent sleepwalking? Why do people sing without accents? What will happen if Ben and Liam eat that 11 year old cheeseburger?

Dr. Karl answers all your science questions, including; when will we have wind turbines for our homes? Does the full moon make you crazy? And the ever-important question - what came first, the chicken or the egg?

Dr. Karl answers all your science questions, including; do solar panels work inside cars? Why do some people get bitten by mozzies more often? Do we all see the same colours?

Dr. Karl answers all your science questions, including; why does eye colour change? Is our perception of time Earth-centric? What's the best temperature to cook eggs?

Dr. Karl answers all your science questions, including; what's the deal with fecal transplants? How do preservatives affect your body? Should a grown man eat his vegetables?

Dr. Karl answers all your science questions, including; can you breastfeed after being bitten by a snake? How do you create artificial gravity? How many nutrients are lost in frozen foods?

Dr. Karl answers all your science questions, including; is gravity stronger underground? Is raspberry cordial good for your gut? Which way do toilets flush on the equator?

It's a Marine Science Special! Professor Emma Johnson joins Dr Karl and Zan Rowe to help answer your ocean-based science questions.

Why do op shops all smell the same? Why can't we use 3D printers to print organs? Is there any benefit to avoiding gluten?