Walk down the drinks section at the supermarket.Look in the drink cooler in your local convenience store.A new drink is taking up more and more space on the shelves，and that drink is water.Bottled water sales in the US rose to 1.7 billion gallons in 2010 for plastic bottles alone，compared to total sales of only 700 million gallons in 1990. Whereas bottled water was once associated only with the rich and the privileged (特权阶层)，it is now regularly drunk by people at all income levels despite the fact that the price of bottled water can be between 240 and 10,000 times higher per gallon than tap water.What accounts for this surprising increase in demand?

    Traditionally，people have drunk bottled water for health reasons.The practice of “taking the waters” originated with the Romans，who believed that a person developed a healthy mind by building a healthy body.Across Europe，drinking or bathing in mineral water has been associated with the power to cure various diseases.Health spas at Evian in France and Pellegrino in Italy began bottling water so that their consumers could continue their treatments at home.The consumers in the 21st century are also concerned about health.However，in America，where the habit of drinking bottled water is relatively new，the concern is often more related to the purity or sterilization (消毒) of the water than to its mineral contents.Americans are often worried about the effects of the chemical pollution and other contaminants on the water supply.Many Americans view bottled water as a safe alternative to tap water.

    Further reasons for drinking bottled water are its usefulness as an aid to digestion，as a complement to a good meal in a restaurant，and for taste.City tap water is often treated with chlorine (氯) to guard against harmful micro­organisms.Chlorine，as well as metals from pipes and tanks used to distribute and store tap water，can leave behind an unpleasant taste.

Teen Conference

    Are you ready to explore the University of Idaho campus, learn life skills for beyond high school, meet new friends and get reacquainted with old ones? Then Idaho 4-H Teen Conference is for you.

●June 27—30 , 2017

●Moscow, Idaho

●Grades 8 to 12

At this conference, teens will:

●Gain leadership skills

●Participate in educational workshops

●Experience campus life and learn about opportunities at the University of Idaho

●Learn about state, national and international 4-H opportunities

●Develop a passion for 4-H

●Make new friends throughout the state of Idaho

Adults at Teen Conference

    Adults are welcome to attend Teen Conference as chaperones(监护人). Please review adult chaperone position description and discover if this opportunity is for you. To apply, please complete the online chaperone application.

College students may also attend as collegiate(学院的)volunteers. Please review the collegiate volunteer position description. To apply, please complete the collegiate volunteer application.

Scholarships

    Please contact your local UI Extension country office to learn how to apply. All participants will be informed by April 1 before registration begins.. Scholarships include:

●Youth scholarships sponsored by the Friends of 4-H

●Adult chaperone scholarships

Conference Proceedings

●Gem State News 2016

    Be sure to visit the Idaho 4-H Teen Conference Facebook page.

    For more information, contact Shana Codr, 4-H Program Specialist.

    The year 3700, Earth is far too hot for any human to call it home. On this planet at least, man is nothing more than a memory--if there is anything left to remember the "wise man". But what about our wisdom--will any of it survive us?

    The conventional answer is no. Knowledge requires a knower, and there will be no knowing minds around then. But if information survives, perhaps in books or hard drives, maybe the knowledge isn't quite dead but dormant(休眠), ready to become alive with the help of other minds that develop over time or come to visit Earth in the distant future.

    At first sight, that seems to be reasonable: after all, we have done similar things with past knowledge. For example, we saved an ancient computer from a ship destroyed at sea off the southern coast of Greece, and succeeded in finding the meaning of Egyptian hieroglyphics(象形文字). Careful work can bring previously lost wisdom back to life.

    However, the key point is that there is a certain cultural continuity with those ancient times that allows us to reason and make progress in the dark: we know we are dealing with the legacy(遗产)of other humans. Without that link, the survival of objects and raw data doesn't guarantee the survival of knowledge. And a lack of continuity in language with any future intelligence would be a barrier. Knowledge is closely connected with language. When a language dies out, we can lose systems of reasoning that they contain. If that's lost, then it can't be recovered.

    All this means that other minds might not be able to fully make human knowledge alive when we are gone. It is better to concentrate on not dying out in the first place.

    In 1996, someone found some very old clothes in an old mine in Nevada, USA; they included a pair of dirty old jeans. Today, those jeans are very valuable, and they are now in the Levi Strauss Archival Collection in San Francisco. The jeans, which are over 120 years old, are the oldest pair of Levi's 501 jeans in the world.

    They are almost the same as a modern pair of 501's; there are just some small differences in the detail. For instance, today's 501's have two back pockets, while the old pair just has one.

    In 1853, a young tailor from Germany, called Levi Strauss, began working in San Francisco; Levi sold thick canvas(帆布) to miners; the miners used the canvas to make tents.

    One day, a miner told Levi that he could not find trousers that were strong enough for work in the gold mines. Levi decided to make some trousers out of canvas. Very soon, he sold all the canvas trousers he had made! They were just what miners wanted.

    However, the canvas was rather heavy and stiff(坚硬的). Levi therefore began to look for a different textile(织物). Soon he found a heavy textile from France; it was denim(斜纹粗棉布). Denim was a bit lighter than canvas, but it was very strong. It was ideal for miners.

    However, original denim was almost white, and miners did not like the color! Their denim trousers got dirty as soon as they began working! Levi Strauss therefore decided to use colored denim, and he chose dark blue. In 1873, he began to make denim trousers with metal rivets(铆钉) to make them stronger. “Blue jeans” arrived!

Levi's jeans were so popular that his company got bigger and bigger. Soon, other firms were making blue jeans too. Miners liked them, but so did cowboys and other working men. Blue jeans became classic American working trousers. After the Second World War, jeans became popular all over the world. Today, blue jeans are made all over the world.

    It's 11 p.m., and I'm still sitting here writing this article for the school magazine! I've had two weeks to write it, and my teacher, Julia, wants it tomorrow. She's always complaining (抱怨) that I leave things till the last minute. Maybe she's right.

    A month ago I made a decision to be more efficient (有效率的) this year. Well, I've clearly failed. I've also been trying to get fitter for four weeks now. I've started going to the health club. I've even been going to bed earlier. But I'm not feeling any fitter, just a little unhappier. I miss my bad habits. Why is leading a better life so hard?

    I've just read an article on a website, and I've discovered that it isn't my fault (过错)! In fact, it isn't anyone's fault. It's our brain's. It's programmed to make it difficult to break bad habits. There's nothing we can do. Scientists have done experiments that show we use one part of our brain when we think about ourselves and another when we think about other people. However, when we think about ourselves in the future, we use the same part of the brain that we usually use to think about other people. In other words, the brain sees the “future you” as a different person than your “present you.” That's why we don't always find it easy to make good decisions for ourselves in the future.

    But that's not all. Scientists have also discovered that it takes around ten weeks to form a good habit. That's the amount (数量) of time the brain needs to accept new behavioral patterns (形式). The good news is that once you make it to ten weeks, everything becomes a lot easier. The bad news is that ten weeks is a really long time, so it's easy to give up what you want to do before then.

    So even when we want to change our ways and become better people, our brains won't let us. Or is this just an excuse? Look — I've finished my article on time! Anything is possible!

As the world deals with the rising temperatures brought by climate change, the demand for cooling solutions in hot, dry regions becomes increasingly pressing. However, traditional air conditioning systems produce massive greenhouse gases and use lots of energy.

Facing these challenges, a research team from McGill University, UCLA, and Princeton have found an inexpensive, sustainable cooling method. Their approach not only offers a solution for cooling but also promises to address the problem of heat waves during electricity blackouts.

The researchers set out to achieve a new standard in passive cooling (无动力制冷) within naturally conditioned buildings in hot climates such as Southern California. They aimed to address an important question: how can passive cooling techniques outperform traditional air conditioning units and improve indoor comfort?

The key to this breakthrough lies in harnessing the potential of radiative (辐射的) cooling materials, specifically in the context of housing design. Traditionally, such materials have been employed to prevent roofs(屋顶) from overheating and improve heat rejection from cooling systems. However, the research team recognised that there is under-explored potential in integrating these materials into building design — they can not only remove waste indoor heat but also drive regular and healthy air changes.

Lead author Remy Fortin stated, "We found we could maintain air temperatures several degrees below the surrounding temperature."Remarkably, they achieved this success without giving up a healthy airing. This was never a piece of cake, considering air exchange can unintendedly introduce heat into the building when the goal is to keep the inside cooler than the outside.

The researchers are hopeful that their findings will be used to positively impact communities suffering from climatic heating and heat waves. Salmaan Craig, the principal researcher expressed their expectations: "We hope that materials scientists, designers, and engineers will be interested in these results and that our work will inspire more broader thinking for how to integrate breakthroughs in radiative cooling materials with simple but effective solutions."