Gli ingegneri giapponesi più talentuosi e qualificati hanno impiegato una vita per rendere il network delle ferrovie attorno a Tokyo tra i più efficienti al mondo. Avrebbero semplicemente potuto chiedere la risposta ad un fungo?!?
What do Tokyo commuter-rail designers and the slime mold Physarum polycephalum have in common? The two will build strikingly similar networks.
A Japan-based research team found that if they placed bits of food (oat flakes) around a central Physarum in the same location as 36 outlying cities around Tokyo, the mold created a network connecting the food sources that looked rather like the existing rail system. And when comparable “topographical barriers” were introduced onto the experimental plane, the links were even more similar.
Coincidence? Not at all, concluded the authors of the study, which was led by Atsushi Tero of the Research Institute for Electronic Science at Hokkaido University in Sapporo.
Like the humans behind a constructed network, the organism is interested in saving costs while maximizing utility. In fact, the researchers wrote that this slimy single-celled amoeboid can “find the shortest path through a maze or connect different arrays of food sources in an efficient manner with low total length yet short average minimum distances between pairs of food sources, with a high degree of fault tolerance to accidental disconnection”—and all without the benefit of “centralized control or explicit global information.” In other words, it can build highly efficient connective networks without the help of a planning board.
Far from a one-off biological curiosity, this experiment led the researchers to develop a mathematical algorithm for their model of adaptive network construction, which can be applied to other microbiological problems—and macro technological ones.
“Self-organization, self-optimization and self-repair as it naturally occurs in the slime mold Physarum polycephalum are capabilities that may be required for technological systems such as mobile communication networks or networks of dynamically connected computational devices,” Wolfgang Marwan of the Magdeburg Centre for Systems Biology at Otto von Guericke University in Magdeburg, Germany, wrote in a perspectives piece that accompanies the study, both of which will appear in the January 22 issue of Science.
Marwan called the mathematical model “beautifully useful.” He added that: “It quantitatively mimics phenomena that can be neither captured nor quantified by verbal description alone.” All aboard the slime mold express. | Katherine Harmon | scientificamerican.com
Credo che nonostante li abbiamo sott’occhio tutti i giorni, una ripassata a questi comportamenti non faccia male a nessuno, anzi ci aiuterebbe a non accontentarci di quello che ognuno già è convinto di fare per l’ambiente e a guardare al di fuori dei nostri confini per imparare e importare, a nostra volta, nuove lezioni di quotidianità.
I have lived in Europe on two occasions now — for five months in the Netherlands (two years ago) and for ten months in Poland (currently). I have been green-minded since I was a young child, and knew that Europe did better on many green issues. Nonetheless, to come here and live here has given me more insight on the perspectives of the people and more of a practical understanding of why Europe fairs so much better than the US on many environmental issues.
Recently, I came up with a list of seven things that really stand out to me as good environmental practices in Europe that could be transferred to the US. These could all be adopted in the US, but some are more personal in nature and some are more systematic. Furthermore, some of the personal ones regard large, life decisions, and some are much simpler in nature and easier to implement into your life now.
Of course, Europe is not one country and things vary from country to country. Nonetheless, there are also several similarities across borders. I have friends in other countries and have traveled a bit as well, so I hope to be sharing the best of the best.
Here’s the list!
1) Live within a pleasant walk or bike ride from where you shop or work (or both), and use these modes of transport! A large percentage of people walk or bike to get groceries or to go to work in Europe. Parking lots at supermarkets and malls are miniature compared to parking lots in the States. A pleasant walk or ride (not just proximity) to your destinations is an important factor — if it isn’t pleasant, it is unlikely your environmental ethic will be stronger than your desire for a comfortable trip. My master’s thesis on bicycling in the United States and the Netherlands confirmed this theory. Of course, there are many hurdles in the system of US cities and how they were built that makes this harder in the US (i.e. it can be hard to find an affordable place in such a location, and it can be hard to find a good route anywhere because of the way we’ve planned around cars), but there are also many opportunities. Often, you can find a back-route and 40% of trips in metropolitan areas in the US are two miles or less, ideal distances for bicycling. For more information on transportation’s environmental importance, read “The Hidden Giant #2: Transportation”.
2) Put a basket on your bike, or buy a bike with a basket! This is common practice in Europe and hardly seen in the US. Although, city bikes, practical cruisers and Dutch-style bikes are becoming more and more popular in the US (read this New York Times article). This may seem like a superficial, aesthetic issue, but I think it is paramount to using the bike for transportation purposes. With a basket on your bike, you can easily go shopping on your bike and it becomes a fun, attractive thing to do.
3) Make recycling visible! This is an interesting one for me, a new one. In Poland, recycling bins are not hidden (like the trash bins are). They are generally very visible and accessible, and they are frequent in many cities and even small villages. Plastic bins are the most prominent. They are large cages and you can see all the plastic that is in them. In a traditional society like Poland, but even in the US, social norms can drive environmental action. When you see a big cage full of plastic, you think, “Hmm,.. it is normal to recycle and I should be sure I am doing it as well.” Social norms and social pressure can be created by simple means such as this.
4) Live in a smaller space. Well, this is a hard one to convince people of, but it is also a big one. Even if you “green” everything in your home, if you live in a big home it can often be more environmentally unfriendly than a smaller home. Live in enough space for your needs, but don’t just have a big home to have a big home. Many of the people in Europe who live in small apartments or townhouses would opt for a big home if they had more choice. I’ve heard this in the Netherlands and Poland repeatedly. Due to governmental policies, an older history, and economical reasons, more people live in smaller homes. Nonetheless, this is a big reason why Europe is more green. People have learned to live in smaller spaces and are very creative and efficient with the use of their space. One example is that people often sleep on fold-out couches (slightly different from the ones in the US), so that your living room turns into a bedroom at night. This works very well, it seems, and is a big space saver.
5) Protect the countryside. Many countries in Europe have strong protection of the countryside around and between cities and towns. This is often governmental, so it is a systematic issue. There is a lot of push to do this more in the US, but it is a struggle and requires citizen support in many cases. If you get involved in the situation where you live, however, planners and government officials are often on your side and just need more citizen demand to make this happen. Protection of greenspace is a common ideal in related government fields these days, and especially in the field of city and regional planning. Make it happen!
7) BYOB: Bring Your Own Bag. Here’s a simple one to end the list. Many people here in Europe bring a reusable bag to do their shopping. I’m not sure how this process became so popular, as many people do not actually have any special care for the environment or see themselves as environmentalists, but it is a common practice. Perhaps, because it is easier — bags are easier to carry and unlikely to break — or because some shops charge for a bag (very few do this, though). Perhaps, it is a habit from the past that was never broken. Whatever the reason, it is easy to do and still has a huge impact — try to count how many plastic bags you use in a year! In the US, Whole Foods Market has banned plastic bags from their stores (pushing reusable bags as much as possible, but still providing paper if needed). Get into the habit and you will find it makes your life easier!