You will want to return to Popovka again. Kazantip has developed its own unwritten laws years ago, and its main symbol - a yellow suitcase - is known to everybody. The yellow suitcase grants the holder the right to enter the Kazantip Festival for free. Don't try to buy the yellow suitcase in a nearby store. It's not available there! The yellow suitcase is a symbol of nostalgia, tradition and freedom of movement. Can any yellow suitcase be the Kazantip suitcase? Of course it cannot. There are definite requirements each suitcase must meet. It's not so easy to get the right one. According to the state standard of Kazantip, the suitcase must be designed in the old classic fashion, with chrome corners and it must be of the right, unique yellow color. A picture of its holder must be attached on the inner side. If you do find such a relic in your grandmother's attic, you can use it as a visa to enter the Kazantip Republic. Acoustic levitation allows small objects, like droplets of liquid, to float. Unless you travel into the vacuum of space, sound is all around you every day. But most of the time, you probably don't think of it as a physical presence. You hear sounds; you don't touch them. The only exceptions may be loud nightclubs, cars with window-rattling speakers and ultrasound machines that pulverize kidney stones. But even then, you most likely don't think of what you feel as sound itself, but as the vibrations that sound creates in other objects. The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float. The process can take place in normal or reduced gravity. In other words, sound can levitate objects on Earth or in gas-filled enclosures in space.|Recycled steel is an increasingly popular, very durable green building material. See more home construction pictures. The drive for energy-efficient building comes down to a quest for the so-called tight envelope. In builder lingo, the better a structure keeps out the wind and the rain, the tighter its envelope. And if you can achieve that tight envelope while using some kind of renewable, recycled material, then that's all the better. But while many new energy-efficient products enter the market each year, some builders shy away from them because of higher costs. In many cases, just adding a layer of insulation or a specially glazed window can increase the cost of materials by 20 to 30 percent. Let's take a look at some of the latest energy-efficient building materials on the market right now. If you check out the material produced by the SteelRecycling Institute (SRI), you might want to skip the wood beams when building your next house.
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