Richard Wiseman is back with another collection of clever tricks and simple science experiments that you can finally use for profit—not just entertaining your friends.

We just suggest keeping one last trick up your sleeve—namely the hasty retreat—since some of the solutions to these bets could very well upset the person you've targeted, particularly when it means they're losing their hard-earned money. But in the meantime, have fun watching them pull their hair out while they try to float a paperclip in a glass of water. [YouTube]