Creating a Water-Powered Hammer Using Stone Age Tools

iStock // vuk8691
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:

20 Weird Clubs That Actually Exist

Mental Floss via YouTube
Mental Floss via YouTube

Groucho Marx once famously quipped that he'd never "want to belong to any club that would accept me as one of its members." Most people would probably say the same about the Martin-Baker Ejection Tie Club—a very exclusive, 63-year-old organization created specifically for individuals who have had their lives saved by an ejection seat. Currently, the club boasts more than 6000 members.

That's just one of the weird and wonderful clubs you'll learn about in our latest edition of The List Show. Join Mental Floss editor-in-chief Erin McCarthy as she hunts down the world's most unusual clubs (Extreme Ironing Bureau anyone?). You can watch the full video below.

For more episodes like this one, be sure to subscribe here!

Video Captures Fiery Eruption of Mexico's Popocatépetl Volcano

RobertoVaca, iStock via Getty Images
RobertoVaca, iStock via Getty Images

Mexico is home to 48 active volcanoes, but few can compete with Popocatépetl. Located around 40 miles southeast of Mexico City, it's one of the most active volcanoes in the country, and on January 9, the extent of its power was caught on camera.

The video above, reported by NPR, shows the Popocatépetl stratovolcano—also known as a composite volcano—spewing lava, ash, and rock in a fiery plume that reached 20,000 feet above its cinder cone crater. CENAPRED, Mexico's National Center for Disaster Prevention, filmed the volcanic eruption as it unfolded early Thursday morning. The National Oceanic and Atmospheric Administration also recorded the explosion from space using its GOES 16 satellite.

No one was hurt by the incident last week, but CENAPRED is warning people to avoid the area as debris continues to fall from the summit. The center has set its Volcanic Warning Light to Yellow Phase 2, which indicates there's no immediate threat of danger.

Since it emerged from dormancy in 1994, Popocatépetl, or "El Popo," as it's known by locals, has become one of the most active volcanoes in Mexico. Tremors and showers of ash are now regular occurrences for residents of nearby towns. Given its volatility, there are currently 20 devices monitoring the volcano 24/7.

[h/t NPR]

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