Alex Ritson

Obviously, they needed to embrace it to be a modern tech savvy country, but they could easily censor it relatively easy.

They could block Web pages that mentioned, for example, the Tiananmen Square massacre or Xinjiang prisons.

AI is far more difficult because the bots, the platforms generate stuff and they get material from a vast range of sources.

So there's no reason why an AI platform might not start talking about how democracy is a great thing with multiple parties.

Or perhaps it'll start saying that Taiwan's been a great success as a de facto country.

So this, I think, is about the Chinese government thinking, well, OK, we we do need this, but we've got to control it.

That said, I think a lot of tech savvy people are going to say you want to start trying to control AI.

Well, good luck with that one.

Paul Moss.

According to recent research, a mysterious force called dark energy, which drives the expansion of the universe, might be changing in a way that challenges our current understanding of time and space.

Some scientists believe we may be on the verge of one of the biggest discoveries in astronomy for a generation.

Here's our science correspondent, Pallab Ghosh.

What we see here on Earth and in the stars and galaxies are made of atoms.

They account for just 5% of the universe.

The rest is mostly something called dark energy.

But what is it?

Now it all started with a big bang.

The universe expanded and astronomers believe that eventually this expansion would slow down under the force of gravity.

Some believe that it would even collapse back in on itself in a big crunch.

Now, in 1998, they made a shocking discovery.