The Bank of England are launching a campaign today to choose the next person to feature on the £50 note.
What's more, they're asking the public to nominate someone to appear on the front of the note!
But the twist is - they want a figure who is famous for their scientific work.
At the moment the £50 note features Matthew Boulton and James Watt - leading figures of a period called the industrial revolution.
That was a couple of hundred years ago... so the Bank of England think it might be time for a change.
Which scientist do you think should be on the £50 note?
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The Bank of England always have famous UK figures featured on their bank notes.
Currently they have former Prime Minister Winston Churchill, novelist Jane Austen and they are introducing a new £20 note with a portrait of artist J. M. W. Turner on it in 2020.
Who would you like to see on the new £50 note? Which historical figure do you think has made a big contribution to UK life?