Great Moments In Science - with Dr Karl Kruszelnic

Great Moments In Science - with Dr Karl Kruszelnic

Australia

From the ground breaking and life saving to the wacky and implausible, Dr Karl Kruszelnicki reveals some of the best moments in science.

Episodes

Minus-calorie celery claim leaves food for thought  

Celery is low in kilojoules but it's the energy it takes us to chew and digest that pushes us into negative calories.

Why we yawn  

Yawning has all kinds of strange links to different aspects of human experience.

Animal poo times  

Headlines don't get much punchier than "All mammals poop in 12 seconds ...".

Ponytail physics  

There's a lot of maths - and a bit of astronomy - behind the sideways swing of a ponytail.

The real cost of air pollution  

It kills millions, and it costs trillions. Air pollution is killer number 5

Cannibalism  

Compared to other animals of the same size, humans just aren't that nutritious. Is that the only thing holding cannibalism back?

Pregnancy while pregnant  

Can a woman get pregnant, when she is already pregnant? In other words, can she have two foetuses in her uterus, at different stages of development?

Cleaning up space junk  

The amount of junk in orbit is always increasing but cleaning it up is also essential for our future space operations, but it’s not going to be easy.

How much space junk is out there?  

Space junk includes old satellites, spent rocket stages, dust from solid rocket motors and even coolant from obsolete Russian nuclear-powered satellites. But just how much is up there?

How the Nobel Prize medals were hidden from the Nazis  

The gold in a Nobel Prize medal is dense enough to make a big impression when you try to take it through an airport X-ray scanner. It's also very resistant to being dissolved—but that didn't stop one chemist who needed to hide two medals from the Nazis, as Dr Karl Kruszelnicki explains.

What we know about misophonia, the 'hatred of sounds'  

A condition called misophonia — where people adversely react to particular sounds, often with feelings of rage, terror, fear and panic — was first identified 20 years ago, but is only now starting to be better understood.

Paying service to the human lip  

They can seal tight, suck, blow, whistle, hold and kiss. With hundreds of muscles and multiple layers of cells, the human lip serves a much greater role than we give them credit for.

Is air conditioning sexist?  

For 50 years air conditioning in commercial buildings has been set using the Standard 55 guidelines. But many workplaces aren't staffed solely with 40-year-old men dressed in 60s business suits, and that's left women out in the cold, as Dr Karl Kruszelnicki argues.

Is air conditioning sexist?  

For 50 years air conditioning in commercial buildings has been set using the Standard 55 guidelines. But many workplaces aren't staffed solely with 40-year-old men dressed in 60s business suits, and that's left women out in the cold, as Dr Karl Kruszelnicki argues.

How humankind has changed our planet  

From the formation of Earth until now, many factors have contributed to its changing state. But humankind has been a major contributor in a relatively very small period of time, as Dr Karl Kruszelnicki argues.

Could we capture and store energy from lightning?  

Could lightning be used to power the planet instead of fossil fuels? Karl Kruszelnicki finds out.

The power of lightning  

It take a unique series of weather factors to create the awesome power of lightning but when it 'strikes' it comes to earth with 1000 times more energy that a household electrical system and with more heat than the sun but capturing this energy is difficult as Dr Karl Kruszelnicki explains.

Why we need a leap second added to our clocks  

As New Year's Eve ticked over to 2017, scientists added an extra second to atomic clocks to compensate for the Earth's variable rotation. But there are pros and cons to doing this, as Dr Karl Kruszelnicki explains.

What if the Earth stopped spinning?  

We know that the rotation of the Earth is gradually slowing down. But what would happen if God, the devil or aliens suddenly and completely stopped our planet from rotating on its axis of spin? Luckily, thanks to improved knowledge about our planet, the geographers can now give us the answers.

The collective intelligence of animals  

There are many reasons animals of the same species congregate in groups. The collective intelligence of a flock helps protect and save energy, keep them on track when migrating and share food discoveries as Dr Karl explains.

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