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Leonardo da Vinci's Piano/Cello Hybrid

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YouTube / tygodnikpowszechny

Leonardo da Vinci sketched an invention dubbed the viola organista more than 500 years ago, though apparently he never built one. Over the years, various versions of this "bowed keyboard" were built, mostly based on da Vinci's sketch.

This year, Polish pianist Sławomir Zubrzycki unveiled his own version of the instrument -- and played it beautifully. Have a look:

But while that video is lovely, it doesn't explain much of what we're hearing, or how it came about. Here's a ten-minute documentary (with English subtitles) explaining how and why Zubrzycki built his viola organista. (If the subtitles don't pop up for you, hit the "CC" button on the YouTube player.)

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Creating a Water-Powered Hammer Using Stone Age Tools
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iStock // vuk8691

A "Monjolo" is a water-powered hammer made from a log and some sticks. It relies on flowing water from a stream to do its work.

In the video below, the anonymous laborer who goes by Primitive Technology on YouTube creates his own Monjolo from scratch. It's effectively a hollowed-out log placed in the path of a stream, supported by a structure of skinny beams. As the log fills up with water, it rises, then the water drains out the back and it comes crashing down again. When it crashes down, that's an opportunity for a hammer head on the end to do something useful—like crushing charcoal or grain.

The creator of Primitive Technology writes:

This is the first machine I’ve built using primitive technology that produces work without human effort. Falling water replaces human calories to perform a repetitive task. A permanent set up usually has a shed protecting the hammer and materials from the weather while the trough end sits outside under the spout. This type of hammer is used to pulverise grain into flour and I thought I might use one to mill dry cassava chips into flour when the garden matures. ...

Like all the Primitive Technology videos, this is done entirely without spoken or written language, and it's DIY paradise. Tune in for a look into what one man alone in the bush can create:

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This Just In
Typewriter Sold at Flea Market Turns Out to Be Rare World War II Enigma Machine

An antique typewriter sold at a Romanian flea market for $114 turned out to be a rare piece of wartime history: a German Wehrmacht Enigma I machine worth tens of thousands of dollars, Reuters reports.

To the uninitiated, the rare electromechanical cipher machine—which was first developed in Germany in the 1920s, and was used to encode and decode Nazi military messages during World War II—resembles a writing machine. But when a cryptography professor spotted it, he knew the device’s true worth. He purchased the relic and later put it up for auction at the Bucharest auction house Artmark.

Artmark employee Vlad Georgescu told CNN that the machine was made in Germany in 1941. It was in near-perfect condition thanks to its owner, who cleaned and repaired it, and “took great care of it,” Georgescu said.

The Enigma I’s starting price was $10,300. On Tuesday, July 11, an online bidder purchased it for more than $51,000. "These machines are very rare, especially entirely functional ones," Georgescu said. Historians, however, say that Romania may still be home to more unidentified Engima I machines, as the country was once allied with Nazi Germany before joining forces with the Allies in 1944.

During World War II, Alan Turing and his colleagues at Bletchley Park, Britain's central codebreaking site, built a giant computer called the Bombe to calculate solutions that solved the Enigma’s supposedly unbreakable code. Some military historians believe that their efforts shortened the war by at least two years.

[h/t BBC News]

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