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Solve tough home improvement problems with twenty of the best tool tips we've ever published. These tool tips are nuggets of wisdom from seasoned pros, experts and clever readers. They'll save you time, effort and money.

Draw a circle with a square - Tack two nails to set the diameter you want, then rotate a framing square against the nails while you hold a pencil in the corner of the square. Rub a little wax on the square so it slides easily.

Cyclone shop vac

Aspirador / esqueam de coletor / The Quest for an Affordable Dust-Collecting Cyclone, Part More DIY Options and a Clarification -

golden ratio - Поиск в Google

The Fibonacci spiral: an approximation of the golden spiral created by drawing circular arcs connecting the opposite corners of squares in the Fibonacci tiling;

Hydrogen, the cleanest energy storage in the Universe, is most of the time associated with high costs, although it is extracted from water, which is the cheapest yet the most precious element to life. Extracting hydrogen from water is done through a method called electrolysis, but doing electrolysis efficiently requires the usage of catalysts such as platinum, which is very expensive.

New Catalyst for Electrolysis Reduces Costs by and Increases Hydrogen Production Fourfold - The Green Optimistic