Newsround's Joe
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8 April 2013 Last updated at 17:55 BST

Newsround's brain boggling competition to get you guys inventing - you two can be an absolute genius - is hotting up and entries are coming in thick and fast.

But if you still can't think of something to invent - Joe's been checking out some of the inventions that have rocked the world.

This morning say cheese - because it's photography!