The Rest Is Science30 Des 2025

What Day Is It, Really?

What day is it, really? And who decided? What happens to time when we leave the Earth? And when might future humans be counting down to the dawn of a New Year in the middle of the day? From missing days and meddling popes to atomic clocks and vanishing centuries, Professor Hannah Fry and Michael Stevens dive headfirst into one of the slipperiest questions in science and society: what IS the time and date? On the way they trace a tiny error by Julius Caesar, a correction by Pope Gregory XIII, and how time itself has bent to human will. In the process, faiths have quarrelled, centuries have blurred or been deleted altogether and yet, we crave precision in a universe that drifts, producing clocks so exact they must pause to let the Earth turn. ------------------- For more information about Cancer Research UK, their research, breakthroughs and how you can support them, visit ⁠⁠⁠https://cancerresearchuk.org/restisscience⁠⁠⁠ Cancer Research UK is a registered charity in England and Wales (1089464), Scotland (SC041666), the Isle of Man (1103) and Jersey (247). A company limited by guarantee. Registered company in England and Wales (4325234) and the Isle of Man (5713F). Registered address: 2 Redman Place, London, E20 1JQ. ------------------- Find The Rest Is Science all over the internet by ⁠clicking ⁠here⁠.⁠ ------------------- Video Producer: Adam Thornton Video & Social: Bex Tyrrell Assistant Producer: Imee Marriott Producer: Becki Hills Senior Producer: Lauren Armstrong-Carter Head Of Digital: Samuel Oakley Exec Producer: Neil Fearn Learn more about your ad choices. Visit podcastchoices.com/adchoices

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Episoder(78)

The Science of Putting Sunglasses on The Sun

Why does the cartoon Sun always wear sunglasses? And how big would a real pair need to be? Hannah Fry and Michael Stevens investigate space mirrors, Reflect Orbital and solar eclipses to find out. ...

9 Aug 1h

Why Is It A Colour Wheel & Not A Line?

Colour wheel or colour line? Light itself runs in a straight line from red to violet, yet every colour theory chart bends that spectrum into a circle and the reason has nothing to do with physics. ...

5 Aug 47min

Why Lithium Batteries SUCK

Can Hannah convince Michael that the lithium-ion battery is one of our most overrated inventions to ever happen? Hannah makes her case using a surprising energy source hidden in your fridge, a bell i...

2 Aug 54min

What Happens Inside Earth's Forbidden Zones?

What grows in the spaces humans are forced to abandon?Hannah brings Michael an actual piece of barbed wire from the Korean Demilitarised Zone, one of the most heavily fortified and forbidden borders o...

29 Jul 45min

It Wasn't A Hoax After All

Did the world really end in 2012? Not with fire, meteors or an ancient Mayan prophecy, but Professor Hannah Fry and Michael Stevens ask whether something just as profound took place instead. To...

26 Jul 59min

Hack Dog Vision To Keep Your Bones Safe

Can you hide your skeleton from a dog? Would you want to know the day you’ll die? Has evolution ever come close to producing a real fire breather? Michael and Hannah test a T-shirt with a secret on...

22 Jul 45min

The Hole In Your Brain That Makes You Doomscroll

Why can't you leave a sealed envelope unopened? Professor Hannah Fry begins by refusing to allow Michael Stevens to open a mystery envelope addressed to him. A small act of torture that turns out t...

19 Jul 49min

A Man-Eating Tiger Found In London

It begins with a discovery in a loft: a full man eating tiger skin, brought back from a village in northern India where Professor Hannah Fry's ex-mother in law grew up. That find sends Hannah and Mic...

15 Jul 41min