Welcome back to the home of the oxymoron. Evil genius. He asked the newspaper to print his obituary early so he'd enjoy it. That's like hiding at your own funeral. Yeah, a big, great gig. I'm Russell Kane. Join me to weigh in on whether the biggest players in history are more evil or genius. Becoming that rich, I'd say that is some level of genius. It also helps that it's a long time ago, right?

It's like the podcast version of telling your kids the ice cream van plays music when it's out of ice cream.

Listen to evil genius on BBC Sounds.

Hello, tonight on free thinking, we have some thought-provoking living space solutions

with architect Douglas Murphy and architectural historian Owen Hopkins.

What can medieval monks teach us about environmental solutions to today's problems?

And poet Sarah Howe will be talking to me about her T.S. Eliot Prize-winning collection, which crosses geographical

and racial boundaries. But first, Lisa Randall is a theoretical physicist who's been disentangling

the cosmological conundrum of dark matter. Lisa is Professor of Science at Harvard University,

and in her book, Dark Matter and the Dinosaurs,

she suggests that even though we can't see or touch it,

dark matter has had a profound effect on the formation of the universe

and an occasionally catastrophic effect on life on Earth.

And Lisa's here to shed some light on that.

I believe the existence of a kind of matter that couldn't be seen was first postulated back in the 1930s, Lisa. But what do we now

understand dark matter to be? Well, you know, that's a great question. And it's one of the big

unanswered questions. We now have much stronger evidence that dark matter exists,

and we know how much of it there is.

That is to say there's matter that really is different than the stuff we're made up of.

It's not made up of atoms.

It's not made up of anything familiar.

But it is matter in the sense that it interacts with gravity-like matter.

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