Dr Karl Podcast

In a special triplej listener talkback, Zan Rowe and Dr Karl discuss the link between mental illness and marijuana use with psychiatrist Dr Matthew Large, from the University of New South Wales.

Does cold storage affect how food metabolises and germinates? Plus: why do some people's eyes squeak when they rub them?; and why can some people make their ears 'crack' when they press them?

Do snipers need to take in to account the Coriolis effect when taking a shot? Plus: what happens if you pee on an electric fence?; and can babies breathe underwater?

Why do some mobile phones ring when they are switched off? And why do many women crave chocolate just before their periods?

Why do wasps survive being frozen? If black is a shade of light, then how does a projector recreate it? Why does cold air clear a foggy windscreen better than warm air?

Do microwave ovens block mobile phone reception? Will vinegar sooth sunburn? How can you 'pop' a yawn?

Can copper pipes be made hard again after they have been overheated then cooled? Why do new tyres sometimes leave a blue mark on the ground? Do sports compression shorts work?

What happens when fruit and vegetables cross-pollinate? Why does my hair appear to grow quicker now I shave my head? Does quantum physics imply the existence of a God?

Why don't scars get dirty the same way as the rest of your skin? Do noise-reducing ear plugs damage your ears if you wear them for too long? Can exercising after drinking alcohol help you sober up more quickly?

How do you get green tomatoes to ripen quickly? Can people on a vegan diet receive the same amount of nutrients as meat-eaters? Can static shocks through headphones be dangerous?