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In general, I think we're more or less shaped and formed by our late 20s. Things come along during that time that make us cynical. By the time you're in your 30s, it's hard to unpick those mindsets that have formed. It takes years of therapy to undo them.
I remember being in Vietnam in my early 20s, at the height of Lonely Planet's fame, and all the travellers would converge on internet cafes to send emails back home. It was a great place to exchange tips and recommendations, so you actually interacted with people.
You see, the thing about us humans is we overcomplicate things. To eat, our food manufacturing processes work on a huge scale, clearing land, rearing livestock, killing it, packaging it. Go big, only to shrink it all back down to small enough to shove in our mouths.
By fermenting tiny single-cell organisms we will be able to synthesise all manner of foodstuffs in the future, everything from pasta to eggs, fish and meat. Small tweaks in the process will enable production of different proteins used to replicate food we already eat.
Having seen many of my friends go through the trial of trying month after month to conceive, then finally the joy of getting pregnant followed by the heartbreak of miscarriage, I know how lonely and isolating it can be to have to go back to square one carrying that heartbreak with you.
We rip out a perfectly good kitchen worth thousands of pounds, only to replace it with another costing roughly the same. The old one has to be disposed of, the new one had to be made. From raw materials, factory processes and transportation the extra effort is substantial. Overcomplication.
Back in humanity's hunter-gatherer days, you only ate meat if you'd recently made a kill, which required a huge amount of effort, and was therefore relatively rare. There's a reason humans only have one set of incisors to rip our meat apart: we're not supposed to eat the stuff at every meal.
In this [show] business you do something rock 'n' roll and then that's it, finished, heads roll. It's best not to take drugs, go to sex dungeons or cause controversy. And those who've done it - Russell Brand, Angus Deayton, whoever - they've really paid for it, even if what they've done is quite trivial.
I met Princess Anne once at a charity do and she said Blue Peter made her realise TV was all lies - she'd gone to Africa on safari with Valerie Singleton and they didn't see a thing, but when she watched it on TV they'd edited in some lion cubs. I was like, 'Oh dear.' I still don't know if she was joking or not.
Since I've left 'Blue Peter' I've presented all sorts of different things. I've done a music show, for instance, and 'Blue Peter' had music on it. I've done a politics show, but on 'Blue Peter' I interviewed the Prime Minister. I've done travel stuff where I've gone abroad, but 'Blue Peter' had that within it as well.
I used to quite fancy Russell Brand, but I'm not sure if it's just because he's funny. He's definitely got something and I can't just switch all that off because of one stupid moment. I fancy Barack Obama too, which is a wrong crush, isn't it? He's a married man, and he's quite old, but he looks young, so he's fair game.
I had a Saturday job in a chemist. The pay was something ridiculous like £2 an hour - it was slave labour - and I spent all day cleaning shelves. On my first day an actress from Eldorado, which was on telly at the time, came in and said, 'Can I have some Replense please?' I didn't know what it was, so I had to ask her and she had to say, 'It's vaginal moisturiser,' in front of a massive queue of people. After one day I was like, 'I don't want to do this job any more, it's just boring.'