The invention of the elevator made city-living possible. It made possible a rapid mixing of cultures and concepts, efficient use of energy—and ultimately, increased economic output. And now there's a further improvement called 'destination despatching'.

The first definite proof of a link between humans and dogs is a 15,000-year-old grave holding a dog, a man and a woman. Intensive breeding of dogs began about 200 years ago, which resulted in most of today's 450-or-so breeds. And there's a definite mutual appreciation society between people and canines

In 2013 the academic journal published an article called, “Taste perception: from the tongue to the testis”. It looked at some of the distinct taste sensations that we register in the Gustatory Cortex - the taste centre of our brain which are picked up by taste buds on the tongue. However, there's a difference between taste buds and taste receptors ... which is where the testis enters the story.

Earth's defence against the existential threat of extraterrestrial rocks has been bolstered. 

But is it really all that important for humanity to have a plan of attack for an asteroid ambush?

It wasn't the first, second or even third issue to come up in the wake of this year's huge undersea volcanic eruption in Tonga. 

But the eruption, and the ensuing tsunamis, did have a far-reaching impact on the kingdom's neighbours and beyond — including on Australia's coastline. 

For a long time our home solar system was all we knew. But since we’ve gotten a better look at other systems near and far, it has become apparent... our solar system is weird.

Dr Karl explains how artificial intelligence detects and distinguishes between look-alikes.

The term 'doppelgänger' goes back centuries, but in recent years the internet has made it much easier to find your look-alike

There's a precise science behind the impact of small, falling objects. Some can be deadly. Others don't pack much of a punch. 

The final installment of why the Earth is suddenly speeding up—after more than a billion years of slowing down. 

How do we measure the rate of the Earth’s revolution, and what happens when the time on our clocks doesn’t quite match up?