David Holmgren (born 1955) is an Australian ecologist and writer, and the co-originator of the concept of permaculture (with Bill Mollison, ...

Dec 17, 2015 · Rhubarb (Rheum × hybridum) is a herbaceous perennial. It is of the Polygonaceae family. Rhubarb is one of the few perennial vegetables.

One purpose of a bike blender is to replace an energy-intensive regular blender with a more sustainable method of making smoothies. A bike-powered blender can ...

Oct 10, 2022 · Acid producing bacteria; these organisms take hydrolized products (soluble organics like sugar) and turn them into CO2, H2, and organic acids.

These 3D printed models accurately simulate a range of uterine depths and widths for nulliparous and parous women. This STARS (Sexual and Reproductive ...

Apr 14, 2013 · The harmonograph has two pendulums that swing perpendicularly with a pen and paper attached. As pendulums swing, they swing at fixed frequencies ...

Oct 16, 2009 · A treatment pond is a simple bioreactor for treating wastewater. It is simply a pond with bacteria and other microorganisms from the environment ...

Jun 26, 2006 · Appropriate technology (AT) is technology that is designed to be "appropriate" to the context it is intended for - including environmentally ...

The most satisfactory hand process consists of cutting the internal threads with a set of taps, and the external threads with a die held in a stock.

A swale is a ditch on the contour. It does not direct water, but holds it and allows it to gradually infiltrate the soil down-slope of it.