You're about to listen to a BBC podcast and maybe it's when I had a hand in.

I'm Tammy Walker and I produce podcasts for the BBC.

My role is to give new and diverse creators a voice with the opportunity to build a career.

That's the thing I love about podcasts.

You start with just a good idea, but then you have the space to see where it goes.

And doing that at the BBC means we can really run with the best stories

while developing the most unique audio talent.

So if you like what you hear, why not check out the huge range of podcast we've got on BBC

Sounds. Hello, I'm Annan Jagatia, and you are listening to Crowd Science on the BBC World Service,

the program that takes your questions about life, Earth and the universe to research as hunting for answers at the frontiers of knowledge.

Now earlier this year you may remember we made a program about time after a question from listener David Sutton.

We explored the history of timekeeping and visited the National Physical Laboratory in the UK,

where atomic clocks keep time accurate to an astonishing one second in 300 million years.

They've also been counting every second for about the last five decades.

That's certainly dedication.

On today's show we'll be revisiting some of those ideas. That's certainly dedication.

On today's show we'll be revisiting some of those ideas, but also exploring new ones based

on questions sent in by other listeners.

Don't worry though, you don't need to have listened to the first program to understand this one and even if you have there's plenty of new mind-bending material this week for you to wrap your head around

But before we carry on Rami why are we doing this program again?

Why are we reversioning the old one?

It's because we've run out of money.

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