How do scientists know how old the Earth is?

Helium is the only truly non-renewable resource, and it's essential for things like MRI machines and nuclear reactors, but should we be worried? And, we turn air into food, so why can’t we get carbon to leave the atmosphere – or helium to stay? In this episode, Cosmos Science Jou ...  Show more

Are you ready to Roomba? Since its launch, more than 40 million autonomous vacuums have made their way into people’s homes, and often – as the research reveals – into people’s hearts.See omnystudio.com/listener for privacy information. 

Today, time travel fiction is everywhere – and we understand the cosmos enough to even speculate what is and isn’t possible. But how old is the notion of travel through time? What sorts of attitudes and ideas concerning the nature of time were seemingly necessary before humans fi ...  Show more

Encore episode. The surface of the Earth is constantly recycled through the motion of plate tectonics. So how do researchers study what it used to look like? Planetary scientist Roger Fu talks to host Maddie Sofia about hunting for rocks that can tell us what Earth looked like a ...  Show more

Today, time travel fiction is everywhere – and we understand the cosmos enough to even speculate what is and isn’t possible. But how old is the notion of travel through time? What sorts of attitudes and ideas concerning the nature of time were seemingly necessary before humans fi ...  Show more

Carbon dating is a way of determining the age of organic matter up to 50,000 years old. But how does it work? Listen in as Allison and Robert explore the uses of carbon dating, as well as the controversial artifacts dated by this method.