How to Dredge Out the Netherlands without Fossil Fuels

The dredging industry has been the backbone of the Dutch economy for centuries. If canals, harbours and rivers weren’t dredged out for a few years, the whole country would literally grind to a halt. Today, dredging happens with oil powered ships. However, the Dutch waterways were dredged mostly by hand for centuries, using simple but ingenious tools. Could it be done again?

Windmill on Ice or Water Bearings Has Low Friction at Low Cost


Simon Gripenberg, an artist from Finland, developed new types of vertical windmills, inspired by ancient Persian windmills and built from recycled materials. Most interestingly, the windmills float in water or spin on ice, so that Gripenberg manages to obtain low friction at low cost. [Read more…]

Think Outside the Sewer

“Shit can move on trucks.” [Read more…]

Wedge Axes

wedge axe

The Finnish Leveraxe is maybe not the most revolutionary alternative to the traditional axe, writes reader Guy Verrijdt. The Logmatic Wedge Axe from New Zealand splits wood more safely and ergonomically than an axe. This video shows how it works. The tool combines elements of splitting wedges and slide hammers. There are more brands available.

Thermal Insulation of Solid-Walls is Underestimated

Oula Lehtinen – CC BY-SA 3.0

Approximately 5.7 million solid-walled houses exist in England, comprising 25% of the housing stock. Most were built between 1750 and 1914. Research shows that their energy efficiency has been underestimated for decades. [Read more…]

Mobile Clothes Washer

The Breathing Mobile Washer was designed so that manually plunging, the washer forces water through clothing. Compared to friction washing with hands, washboards and rocks, the mobile washer is easier to use, much less abrasive, reduces wear on clothes, and provides a superior clean. Review.