Jerker line systems can be used to operate water pumps or sawing machines, to forge iron, to process food or fibres, or to make paper.
Long-distance power transmission predates the invention of electricity by almost four centuries.
A modular system unites the advantages of standardisation (parts can be produced cheaply in large amounts) with the advantages of customisation (a large diversity of unique objects can be made with relatively few parts).
A car with a top speed of 270 km/h can be driven anywhere on Earth, while an electric velomobile with an electric assistance of up to 50 km/h is illegal is most countries.
About a quarter of the existent wind turbines would suffice to power as many electric velomobiles as there are people.
A cargo cycle is at least as fast as a delivery van in the city - and much cheaper to use.
The Spanish botijo is a water bottle that cools itself, without electricity.
Modern research, which combines ancient knowledge with fast computing techniques, shows that passive solar cities are a realistic option, allowing for surprisingly high population densities.
Virtually all human cultures have made baskets, and have apparently done so since we co-existed with ground sloths and sabre-toothed cats.
For being such a seemingly ordinary vehicle, the wheelbarrow has a surprisingly exciting history.
The old-timers on these pictures are not moving furniture or an oversized load. What can be seen on the roof is the fuel tank of the vehicle - a balloon filled with uncompressed gas.
Almost all of the leading economies in Western Europe during the last millenium relied on a large-scale use of fossil fuels such as peat and coal.