This awesome rollercoasteroid staircase is underway in Germany:

The walkable, large outdoor sculpture Tiger & Turtle – Magic Mountain is currently in construction on the Heinrich Hildebrand Höhe in Duisburg Wanheim (D). It overtops the plateau with the artificially heaped-up mountain by 21m | 23yd so the visitor can rise by more than 45m | 49yd above the level of the landscape and enjoy an impressive view over the Rhine.

Tiger & Turtle – Magic Mountain / Heike Mutter + Ulrich Genth (via Crib Candy)

A new material developed by scientists at UC Irvine is described as the "world's lightest material," so light it can perch atop a dandelion clock without disturbing the seeds. The material is documented in the Nov 18 Science.

The new material redefines the limits of lightweight materials because of its unique “micro-lattice” cellular architecture. The researchers were able to make a material that consists of 99.99 percent air by designing the 0.01 percent solid at the nanometer, micron and millimeter scales. “The trick is to fabricate a lattice of interconnected hollow tubes with a wall thickness 1,000 times thinner than a human hair,” said lead author Dr. Tobias Schaedler of HRL.

The material’s architecture allows unprecedented mechanical behavior for a metal, including complete recovery from compression exceeding 50 percent strain and extraordinarily high energy absorption.

Multidisciplinary team of researchers develop world’s lightest material (Thanks, Fipi Lele!)

(Image: Dan Little, HRL Laboratories LLC)

Julian Allwood and Jonathan Cullen's Sustainable Materials - with Both Eyes Open: Future Buildings, Vehicles, Products and Equipment - Made Efficiently and Made with Less New Material is a companion volume to Sustainable Energy Without the Hot Air, one of the best books on science, technology and the environment I've ever read.

We review a lot of popular science books around here, but Sustainable Materials (like Sustainable Energy) is a popular engineering text, a rare and wonderful kind of book. Sustainable Materials is an engineer's audit of the materials that our world is made of, the processes by which those materials are extracted, refined, used, recycled and disposed of, and the theoretical and practical efficiencies that we could, as a society, realize.

Allwood and Cullen write about engineering with the elegance of the best pop-science writers -- say, James Gleick or Rebecca Skloot -- but while science is never far from their work, their focus is on engineering. They render lucid and comprehensible the processes and calculations needed to make things and improve things, touching on chemistry, physics, materials science, economics and logistics without slowing down or losing the reader.

The authors quickly demonstrate that any effort to improve the sustainability of our materials usage must focus on steel and aluminum, first because of the prominence of these materials in our construction and fabrication, and second because they are characteristic microcosms of our other material usage, and what works for them will be generalizable to other materials.

From there, the book progresses to a fascinating primer on the processes associated with these metals, from ore to finished product and back through recycling, and the history of efficiency gains in these processes, and the theoretical limits on efficiency at each stage. Lavishly illustrated and superbly organized, this section and the ones that follow it are a crash course in the invisible energy embodied in the bones of our built up world.

But the primary work of the book is to look at how small (and large) changes in our society and business could make important gains in the sustainability of our material use, an important subject as developing nations start to copy the rich world's insatiable appetite for material goods and titanic cities.

As with Sustainable Energy, Sustainable Materials is a valuable, impartial expert source in an important debate. While it explains the measures that can improve our materials usage, it also lays out the tradeoffs that these measures entails, the the relative benefits to be gained by each trade -- but it doesn't lecture or demand, merely invites the reader to consider the engineering facts and decide for herself what to do about them.

The publisher has put up a great website for the book, with free, downloadable text, and some good supplementary materials.

Sustainable Materials - with Both Eyes Open: Future Buildings, Vehicles, Products and Equipment - Made Efficiently and Made with Less New Material

TaiStar42 accomplishes a jaw-dropping feat of dexterity, balance, and impractical engineering in this clip in which he balances 3,118 coins on a single, thin dime.

balancing tower of change 3118 coins on a single dime. 600 quarters, 501 dimes, 313 nickels, 1699 pennies, 5 foreign coins, and 7 hours of building. all real time clips,

The Burj Khalifa is the tallest building in the world. It's located in Dubai, a city with a lot of other skyscrapers. What Dubai doesn't have: A central sewage infrastructure that can accommodate the needs of a bunch of skyscrapers.

You see the problem.

Last night, while listening to NPR's Fresh Air, I heard Kate Ascher, author of The Heights: Anatomy of a Skyscraper, explain what happens to sewage from the Burj and Dubai's other tall buildings. It's only Tuesday, and this may be the craziest fact I hear all week.

TERRY GROSS: Right. So you know, you write that in Dubai they don't have, like, a sewage infrastructure to support high-rises like this one. So what do they do with the sewage?

KATE ASCHER: A variety of buildings there, some can access a municipal system but many of them actually use trucks to take the sewage out of individual buildings and then they wait on a queue to put it into a waste water treatment plant. So it's a fairly primitive system.

GROSS: Well, these trucks can wait for hours and hours on line.

ASCHER: That's right. I'm told they can wait up to 24 hours before they get to the head of the queue. Now, there is a municipal system that is being invested in and I assume will connect all of these tall buildings in some point in the near future, but they're certainly not alone. In India many buildings are responsible for providing their own water and their own waste water removal.

So it's, it's really – we're very fortunate in this country that we assume we can plug into an urban system that can handle whatever waste the building produces. That's not the case everywhere else in the world.

GROSS: Well, it really illustrates one of the paradoxes of modern life, that we have these just incredible structures that reach, you know, that seem to reach to the sky and then in a place like Dubai you have a 24 hour long line of trucks waiting to dispose of the waste from those buildings.

ASCHER: Right. Well, you know, you have to remember that a place like Dubai really emerged in the last 50 years. It was a sleepy, you know, Bedouin town half a century ago. And what you do is when you bring in the world's, you know, most sophisticated architects and engineers, you can literally build anything, including a building of 140 or 150 stories. But designing a municipal network of sewage treatment is in some ways more complex.

It certainly requires more money and more time to make it happen, so one just seemed to jump ahead of the other.