Lifehacker's got some interesting tips this week, from putting your club cards into iPhone form, to making a water bottle into a juicer (homeless style), and building your own outdoor theater. They also have something about knots.

Know your knots with this handy knot guide. Knots. They're writing about knots.
Make scanner-friendly "club" cards on your iPhone
Google Squared formats your searches into spreadsheets

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Use the bottom of a water bottle as a juicer, because you don't have $2.95 for a real one
Make a DIY iPhone stylus
The Serene Workspace

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Build your own pizza oven
Build your own outdoor movie theater
Magnet hacks

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