How does gravity distort time?

Hi Naked Scientists]

I have listened to pretty much all your podcasts, and have built up a lot of dumb questions, and knowing the only dumb question is the one not asked, I have loaded up. (I apologize if any of these have been covered, or if I should have figured them out .)

They say gravity distorts space-time, why do all shows only show the space distortion? Could you explain the time distortion part? ( I bet you can explain it on the radio better.)

Great show, I wouldn't change a thing (except for having really naked scientists).

Regards,
Dave