This BBC podcast is supported by ads outside the UK.
Scientists in the United States claim to have used genetic engineering and ancient preserved DNA to bring back the dire wolf,
an animal that went extinct more than 10,000 years ago.
I'm William Lee Adams.
And on What in the World, we're looking at the dire wolf and asking why scientists want to bring them back.
What in the world is a daily podcast from the BBC World Service?
We go in-depth on a different topic every weekday in under 15 minutes.
Listen wherever you get your BBC podcasts.
This box here has might be close to 50 little stones.
They're tiny.
They're like marble size and there's a lot of them.
And then this box has two very big stones.
They're bigger than golf balls.
Hello and welcome to Crowdsides from the BBC World Service.
I'm Anand Jagatia.
And this week, our story begins with a really unusual rock collection.
These ones are colour coordinated.
That was very organised.
I know what you're thinking.
Normally, when someone offers to show you their rock collection, you pretend you have other plans.