Mind Games will be repeated on Fri night/Sat morning at 3.00am.
So, the big question is "is it worth taping"?
Here's what the BBC listings say:
Mind Games
Can you time nine minutes exactly using just a seven-minute and a four-minute hourglass? Quizmaster Marcus du Sautoy quizzes Kathy Sykes, Michael Rose, Helen Pilcher and Peter Duncan.
BTW.
If they run for 4 minutes and 7 minutes, why are they called hour glasses?
