Just before this BBC podcast gets underway, here's something you may not know.

My name's Linda Davies and I Commission Podcasts for BBC Sounds.

As you'd expect, at the BBC we make podcasts of the very highest quality featuring the most knowledgeable experts and genuinely engaging voices.

What you may not know is that the BBC makes podcasts about all kinds of things like pop stars,

poltergeist, cricket, and conspiracy theories and that's just a few examples.

If you'd like to discover something a little bit unexpected, find your next podcast over at BBC

Sounds.

Right, let's measure that. That's 100 CC precisely and the buying machine. Sugar. Sugar. we just need five apples.

Start cutting there if that is up. Measuring, weighing and the like are all perfectly straightforward in the kitchen

at the gas station forecourt too, but in the kitchen at the gas station

for court too but in the quantum world of atoms and particles of light

photons

measurement is very different it's complicated and as you'll hear on this edition of Discovery from the BBC

it's worrying the top scientists.

Classically, it really doesn't matter whether you are measuring something or not. It still has the property that you are meant

to be observing independently of your observation. And so basically, classically, whatever you measure just uncovers whatever was already there before you started your measurement.

But quantumly, you actually become really entangled to the system that you're measuring.

Put more drastically...

Essentially the things that we could potentially measure, but don't actually measure,

they don't really exist, so things don't exist before we actually observe them.

Which sounds crazy. I'm Roland Pease and my wish to make a program about the problem with

quantum mechanics came to a head when I met the godfather of modern physics recently Nobel laureate Stephen Weinberg.

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