Hi everybody, just to let you know we've got a very special guest on the podcast today to replace Dan Shriver, who has momentarily disappeared.

And that guest is the fantastic Steve Mold, very much friend of the podcast, Friend of QI.

Actually I think has made an appearance on QI.

He's a science presenter and communicator extraordinaire. He's one third of the Brilliant Troop festival of the Spoken Nerd.

Please do check out his work, go to his YouTube page, his full of amazing mind-blowing, bizarre, extraordinary science videos.

It really is a great place to hang out online and definitely listen to the festival of Spoken Nerd's podcast,

which is called a podcast of unnecessary detail where they take subjects you might think are boring if you're a fool.

And show you that they are, of course, fascinating. It really is worth a listen and we had a great time having him on the show.

Okay, here we go.

Hello and welcome to another episode of No Such Thing as a Fish, a weekly podcast coming to you from the QI offices in Covent Garden.

My name is Andrew Hunt Murray and I'm joined this week by James Harkin, Anna Tijinsky and it's a very special guest.

Steve Mold, we have gathered around the microphones with our four favourite facts from the last seven days and in no particular order, here we go.

Starting with fact number one and that is Steve.

My fact is that protons taste sour.

How do you, you can't get the cutlery small enough for that. How do you taste a proton?

So actually every time you taste something sour, you're tasting protons.

Oh, okay, that's a slight, is that a different fact to the same fact?

I would say it's the same fact. So Steve, does everything have protons in it?

Oh, I see what you mean, free protons.

Everything's got protons on their own.

So you know you have five taste senses on your tongue, sweet sour, salt, bitter and umami.

And your sour taste, it just works in a completely different way.

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