Excavator mulches trees in seconds
An evening pause: The speed and efficiency in which this excavator mulches a tree is almost nightmarish. Makes me think of innumerable science fiction disintegrator ray guns.
Hat tip Edward Thelen.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
I ran a tractor-mounted brush hog as a teenager. This thing is in a whole other class. I’m assuming hydraulically-driven counter-rotating saws, but, man alive. Trees just disappear.
With the right tools (a modification of this?) made from martian iron (15% of the regolith) this is how fast you could dig trenches for martian habitats. The finishing work would take a bit longer of course, but there is no reason they have to live in cramped quarters (tuna cans.)