Comedian Dara O'Briain has said he fulfilled a long-held ambition when he met Prof Stephen Hawking.
The funnyman interviewed the theoretical physicist for a documentary for BBC1.
"It was huge for me because when I was 16 I asked for his book, A Brief History Of Time, as a Christmas present," he told Ryan Tubridy on 2fm.
"I remember bringing it with me to the BT Young Scientist competition and the same book is still on the shelf, so I brought it to him.
"I never had a proper sit-down with him before. I asked him about his views on assisted suicide, his illness (motor neuron) and about parenting.
"It takes him 10 minutes to write down an answer to a question, so it meant I tried to ask enormously important questions."