Green Building with Tire Bales

Recycling is better than throwing things away. But reuse is better than recycling. And in fact, avoiding use is best. I was at dinner with Duncan Hagar last week when he talked about the house he and his wife built in Colorado. They use tire bales and took advantage of passive solar. They have a blog with interesting details on the green house built by 2 engineers. Tire bales area form of reuse (and while some tires are recycled into asphalt and such things, most waste tires go into landfills).

A tire bale is a “big square brick” of about 100 compressed whole tires. Each bale is approximately 5 feet deep by 5 feet wide by 2.5 ft. high and weighs about 2,000 lbs. (1 ton). A tire bale (by itself) has an energy rating of somewhere between R-40 and R-200 depending on which study you read and how it’s used. The tire bales are encased in concrete, effectively making the tire bale walls of our house about 6-feet thick.

Our house uses approximately 170 full bales and about 5 half bales or about 17,000 tires. Tire bales are FREE as long as one presents a building permit. All we had to do was get the bales hauled from Sedalia to Granby Colorado, a distance of about 135 miles.

The tire bales are stacked like bricks to make up all of the outer walls. These walls form the structural integrity of the house. Shot-crete (sprayed on concrete) is applied to finish the walls, effectively creating a minimum 6-foot thick wall. The entire south of our house is glass windows and doors. This creates a large, active thermal mass, which should maintain a relatively constant temperature of 65-degrees. Imagine the energy savings!

Tire bales are not that new. They have been used for quite some time for building barns, holding river banks, and road construction. Using them for house construction is a fantastic and practical idea whose time has come.

Tire Bale Home Keeps Us Toasty Warm

The house has been warm through the winter months on sunny days, it gets as high as 84 degrees even hotter when sitting directly in the sunshine. At night the temperatures hang around 60 degrees without a fire going in the wood stove and 70-74 degrees with a fire going when outside temperatures are above 10 degrees. We have noticed that when outside temperatures dip under 10 degrees or go sub-zero, we have to really boost the heat in the house either by a constant rip-roaring fire and/or using the baseboard heaters. Fortunately, we have had a mild winter. You see, it takes about 3 years for the thermal mass to completely “heat up” and we’re just now coming into the third year. The most notable difference in the temperature of the house seems to be how much sun we get during the day and are the window coverings closed as quickly as possible when the sun sets or when the sun goes behind clouds for too long.

Related: Concrete Houses 1919 and 2007How tire bales are madeHistorical Engineering: Hanging Flumeposts on mortgages

Wall street journal video on the house and difficulty of financing unique green homes:
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NHL Experiments with the Rules of Hockey

The NHL’s ice-capades

The players—who were, in an attention-getting wrinkle, mostly top junior stars eligible for the 2011 draft—road-tested everything from two-on-two overtime to shallower nets to having the second referee view the play from an elevated off-ice platform. On day two, viewers were confronted with the bizarre spectacle of the traditional five faceoff circles being replaced by three, running up the middle of the rink.

Placed in charge of the R & D effort, and the sales job surrounding it, is retired hockey great Brendan Shanahan, now the league’s vice-president of hockey and business development. “There were some ideas that were adventurous and others that were subtle,” says Shanahan, about the recent camp. “I wanted to capture the full spectrum.” Shanahan, who had the final say on the testing schedule, takes the scientist’s view that a “negative” experimental result can be as useful and instructive as a “positive” one. “Sometimes you just have to see things play out to really satisfy your curiosity,” he says. “What I told people that got sort of frightened at some of our far-out ideas is that sometimes your goal is to breathe life into an idea—but other times, you try it out because it’s time to put it to bed.”

I applaud their willingness to try experiments. I am a sports fan who doesn’t find much interest in the NHL, but I do enjoy Olympic hockey.

Related: Teen Goalie Designs Camouflage PadsEngineering a Better FootballRandomization in SportsBaseball Pitch Designed in the Lab

The DIY Movement Revives Learning by Doing

School for Hackers

The ideal educational environment for kids, observes Peter Gray, a professor of psychology at Boston College who studies the way children learn, is one that includes “the opportunity to mess around with objects of all sorts, and to try to build things.” Countless experiments have shown that young children are far more interested in objects they can control than in those they cannot control—a behavioral tendency that persists. In her review of research on project-based learning (a hands-on, experience-based approach to education), Diane McGrath, former editor of the Journal of Computer Science Education, reports that project-based students do as well as (and sometimes better than) traditionally educated students on standardized tests, and that they “learn research skills, understand the subject matter at a deeper level than do their traditional counterparts, and are more deeply engaged in their work.” In The Upside of Irrationality, Dan Ariely, a behavioral psychologist at Duke University, recounts his experiments with students about DIY’s effect on well-being and concludes that creating more of the things we use in daily life measurably increases our “feelings of pride and ownership.” In the long run, it also changes for the better our patterns of thinking and learning.

Unfortunately, says Gray, our schools don’t teach kids how to make things, but instead train them to become scholars, “in the narrowest sense of the word, meaning someone who spends their time reading and writing. Of course, most people are not scholars. We survive by doing things.”

I am a big believer in fostering kids natural desire to learn by teaching through tinkering.

Related: Build Your Own Tabletop Interactive Multi-touch ComputerHome Engineering: Building a HovercraftScience Toys You Can Make With Your KidsHands-on High School Engineering Education in MinnesotaAutomatic Cat Feeder

Understanding the Chemistry Behind Cooking

Video either broken by bigthink or their system is extremely poor causing minutes of failure to load 🙁 Removed.

The science behind cooking is very interesting. I would have been more interested in cooking if I was exposed to more of this early on in my life.

Related: The Man Who Unboiled an EggDon’t Eat What Doesn’t RotRethinking the Food Production SystemThe Calorie DelusionTracking the Ecosystem Within Us

Friday Fun: Aerodynamics for Sports

“Impossible” Soccer Kick Leads to New Physics Equation

The amazing goal — which left French goalkeeper Fabien Barthez too stunned to react — was scored during a friendly match in the run up to the 1998 World Cup. A group of French scientists, perhaps desperate to prove that at least the laws of physics weren’t actively rooting against their national team, have been able to figure out the trajectory of the ball and, with it, an equation to describe its unusual path.

It all comes down to the fact that, when a sphere spins, its trajectory is a spiral. Usually, gravity and the relatively short distance the ball travels cover up this spiral trajectory, but Carlos was a mere 115 feet away and kicked the ball hard enough to reveal its true spiral-like path.

In this open access paper, the spinning ball spiral, the authors explore the science behind ball paths in different situations.

one can identify sports dominated by aerodynamics (table tennis, golf and tennis) and sports dominated by gravity (basketball and handball). In between, we find sports where both gravity and aerodynamics play a comparable role (soccer, volleyball and baseball). Indeed, in the first category of sports, the spin is systematically used, while it is not relevant in the second category, and it only appears occasionally in the third one, in order to produce surprising trajectories.

Related: Friday Fun: Amazing GoalThe Science of the Football SwerveEngineering a Better Football

Appropriate Technology: Rats Helping Humans

Giant rats put noses to work on Africa’s land mine epidemic by Eliott C. McLaughlin

Bart Weetjens is the brain and Buddhist monk behind APOPO (a Dutch acronym meaning Anti-Personnel Land Mines Detection Product Development), which trains HeroRats. He said Mushi’s initial repulsion is common.

Prejudice against rats is “deep in our psyche” and has roots in the Middle Ages when the rodents were blamed for the plague, Weetjens said. He quickly cited Black Death’s rightful culprit: fleas.

The International Campaign to Ban Landmines says land mines and related devices were responsible for 73,576 casualties worldwide from 1999 to 2009. Campaign data from 2007 say there were 5,426 recorded casualties, with almost a fifth of them in 24 African countries.

The cost to train a rat is 6,000 euros ($7,700), roughly a third of what it costs to train a dog. Where dogs need expansive kennel facilities and regular veterinary care because of African climates, APOPO’s kennel facilities at Sokoine University of Agriculture in Morogoro, Tanzania, can house up to 300 rats. The rats see a single vet once a week and are much easier to transport than dogs, Weetjens said.

It is very sad what people do to each (setting up land mines to blow each other up for example). Thankfully we also do great things. I particularly like the engineering mindset behind appropriate technology solutions as I have written many times. They are also looking to have rats help detect tb and cancers. You can fund a rat for 5 Euros (about $6.5) a month to help free the world of landmines.

Related: applying the technology wellEngineering a Better World: Bike Corn-ShellerWater Pump Merry-go-RoundHigh School Inventor Teams @ MIT

See a video of a rat at work:
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The Mystery of Empty Space

Get ready to re-think your ideas of reality. Join UCSD physicist Kim Griest as he takes you on a fascinating excursion, addressing some of the massive efforts and tantalizing bits of evidence which suggest that what goes on in empty space determines the properties of the three-dimensional existence we know and love, and discusses how that reality may be but the wiggling of strings from other dimensions.

Related: HiggsLooking for Signs of Dark Matter Over AntarcticaFeynman “is a second Dirac, only this time human”