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This week at Treehugger: We dig into to our archives and find some hidden DIY gems. A chair made completely from recycled rulers. Converting your car to harness the power of cooking grease. And, grow a DIY hydroponic garden.

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Recycled Red Ruler Chair Who knew rulers could be so cool? Dorothy Spencer uses more red rulers than your kidnergarten teacher could even imagine to make an old-school (literally) chair. The red colored measuring sticks give the impression of a cool, retro painted chair without the layers of sticky paint.

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How To: Convert Your Diesel Car to Run on Food Grease With the sudden media coverage on alternative fuel sources for our cars, we thought this would be a good time to search our archives for biodiesel. And, low and behold, we found this awesome conversion kit for “regular” diesel cars. For the green and/or cheap, learn how to convert your diesel engine to run on grease and get the benefits of clean, and often free fuel.

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Hydroponics Online: DIY Hydro-garden With spring just around the corner, city-dwellers everywhere are trying to figure out how they are going to grow some greenery in the little space they do have. Well, fear not – we found a hydroponic garden kit that you can build for about $100. All you need is PVC pipe, some empty soda bottles, and a pond pump, and your tiny garden will be the envy of every one in your complex.

That is it for this time, look for more TreeHugger goodies next week.