Why does earwax taste so bitter? Why does food in our mouth always go to our most dominant side? What are memories physically made from?

Is staring at a solar eclipse damaging? How does one dog year equate to 7 dog years? Why does it physically feel so good to turn your alarm off and go back to sleep?

Special guests Dr Bryan Lessard from the CSIRO and Dr Rebecca Johnson from the Australian Museum join Dr Karl and Zan to answer your science questions.

What is happening in the brain when someone experiences synasethesia? What would happen if we had more than one moon? How fast would you need to travel to keep up with the sun?

How many farts would it take to kill someone in an enclosed space? Have we ever got any replies from out messages to space? Why do people rock when they're anxious?

What's the deal with morning breath? Why do babies get hiccups when they laugh? How is scent linked to memory?

How do you get music out of a vinyl record? What would happen if you reflected the sun's light back at it? Would ants survive without their colony?

Why don't your teeth grow, like nails or hair? What is the smallest particle and what is it made up of? How does natural instinct work?

Professor Stephen Bartlett joins Dr Karl and Zan to answer all of your Quantum mechanics questions.

What would happen if the earth stopped rotating? Can you stick coins to your forehead, through your own magnetic field? Do penguins have knees?

Is there a way i can prove the earth is spinning? Where would a helium balloon go in space? Can you eat spider venom?

Why does my dog like to eat its own hair? What's actually happening when we get butterflies in our stomach? Are there any parts of the human body that are inedible?

Where does all the poo in the world go? Why do we scream when we're in pain? What would happen if something went faster than light speed?

Why can birds stand of electrical wires, without getting shocked? Why do I get sick from video games and 3D movies? Can you melt wood?

Does shaving your armpits make them less smelly? Why can we eat mouldy cheese, but not mouldy bread? How do homing pigeons know where to fly home to?

How do dogs remember, or learn, that they've misbehaved? Why doesn't rainwater collected from a roof go bad? When sucking air out of a bottle, why does it form a vaccum?

What is the evolutionary purpose of having a facial reaction when seeing others in pain? Why doesn't the moon crash into the Earth? Can you measure the speed of smell?

Why do you have to pee every morning when you wake up? Why are sunsets different colours on different days? Can personality traits be genetic?

Do women's periods sync up when they live together? Is there any evidence for someone having a truly photographic memory? Why does your face go red when you drink alcohol?

Is there a link between migraines and De Ja Vu? Why does lightning strike before thunder? Would a full hard drive weigh more than an empty hard drive?

Why do I sweat more than my friend? How many names and faces is it possible for a person to remember? Why do people with Tourette syndrome swear in their outbursts?

Is it possible for humans to have superpowers? Should we just let asteroids hit the earth so we can make use of the precious elements they contain? Why do I always wake up before reaching my destination?

Professor Brian Greene, Theoretical Physicist and String Theorist from Columbia University joins Dr Karl and Zan to answer all your multiverse and string theory questions.

Dr Karl and Zan are joined by Bubble Physicist Dr Helen Czersky to answer your questions like: why stout bubbles go down, whether or not we'll ever see space elevators and whether we all see the same colours.

Dr Karl and Zan are joined by Astrophysicist Professor Lisa Harvey-Smith to answer your star based questions like: Where does space end? Is it possible there are multiple universes? What is Spaghettification?

Dr Karl and Zan are joined by Meteorologist Nate Byrne to answer your weather based questions like why injuries flare up when it rains, what keeps clouds in the sky and whether you could survive a tidal wave.

Why do you get an egg on your head when it gets hit? How much does a soul weigh? Why do you wake up with a song stuck in your head?

Can you conceive a child in space? How far away are we from teleportation? Is there such a thing as clean coal?

Can you talk yourself out of a migraine? Why do we cry? Can a tree live forever? What causes the tingly feeling you get when you get excited, or inspired?

Professor Claire Collins answers: What happens if you cut out all sugar? Would diabetics benefit from a vegan diet? Why does fruit give you the runs?

Is the universe a hologram? Why do adolescent men act more like pack animals? Why does a bee come in and out of my house and land in the exact spot each time?

Why are we ticklish? Why do some pop-corns never pop in a saucepan, or microwave? If you're drunk and you have a blood transfusion, would you become sober?

Why are moths attracted to lights? What exactly is happening on my skin when I feel itchy? Why does my cold finger not work as well on a phone touch-screen?

Why do I want to hurt cute things? Why does a stomach grumble when it's hungry? What physically happens when you lose your voice?

Does a fart smell worse if it happens underwater? Would a snake be able to untie itself from a knot? What are cosmic strings?

With special guest Ruben Meerman the Surfing Scientist!Why do people use the ketogenic diet for weight loss? Is intermittent fasting good for weight loss? What happens if you don't eat ANY fruit and veg?

What gives clouds their colours? Why does only one side of my glasses fog up when I put them on? What causes pins and needles?

Does the moon affect the water in our bodies? Do animals have accents? Why does your face screw up when you eat sour things?

What are the purpose of tears? Can spiders get caught in other spiders webs? How does traffic form on the freeway?

Is it possible to travel back in time to visit yourself? If the human species was shrunk, would we be a more sustainable species? Do parallel universes exist?

What caused the big bang? Why is it that when you say a word multiple times you forget its meaning? When you have a cold, why can only one nostril get blocked?

How many sports drinks is too many? Can you die of heart break? Is it possible to re-animate a dead body?

Why does hand colour/ type change after chemo? How long does it take your body to adjust to a new time zone? What do sharks think about magnets?

What happens to your body when you mix alcohol with energy drinks? Why does wet skin shrivel? And why is it that your're more susceptible to other people's tickling than your own?

If you put two magnets on either side of your head, what happens to your brain? Will time travel be possible in my lifetime? Why can dogs drink disgusting looking water?

Is laughter contagious? When I look into a spoon, why is my reflection upside down? Why does your voice sound different when recorded?

Is Pluto a planet? Does peeing on your feet cure fungal infections? Are humans more intelligent now than in the past?

Can jet fuel melt steel beams? If the sun went supernova, what would we see? Why can we crack bones in our body?

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?