Hobbies & Science : Society & Culture & Entertainment
Metal engraving with acid is a technique that offers the craftsman a lot more design freedom than more traditional techniques. Whereas engraving with a tool removes metal to create patterns, acid erodes the surface, revealing the lower layers. Acid enables the engraver to create free form patterns w
Cyanobacteria is commonly known as red slime bacteria or blue-green algae, although as a plant and bacteria hybrid it is not truly an algae. It appears in both salt water and freshwater aquariums. Although Cyanobacteria is unsightly, it is generally not harmful to the aquarium itself, but if left un
Soil contamination is a serious environmental threat.Arid soil image by Igor Baryshev from Fotolia.comWithout soil, there is no agriculture. Without agriculture, there is no human society. Soil contamination--defined by the US Environmental Protection Agency (EPA) as either solid or...
Ursa Major, or the Great Bear, includes 16 named stars. Some of these stars also make up the asterism, or distinctive group of stars, known as the Big Dipper. Ursa Major appears in the northern hemisphere and shines brightest during the month of April. Ursa Major sits far enough away from the visual
If you are working with pieces of wood that are pretty rough on the edges, a jointer may be just the tool you need. Often, wood comes in less than perfect condition, and a tool that can smooth it out would be a great asset. This is where the jointer comes in handy. It is very easy to use, and it ca
Located between San Francisco and Los Angeles, plus Yosemite and Sequoia national parks, are among the country's many beloved wilderness preserves that are home to some of the largest, most majestic trees in the world. While visiting the parks, check out the many famous trees, including the great Bu
Wood carving is an art that has been around for generations. It used to be done with a simple knife and a block of wood, but there is a trend these days toward applying power tools to the job. There are many power tools available today that help amateur and professional wood carvers alike create the
The Romans were masters in manipulating their surroundings. They built roads through the most inhospitable terrains, grew exotic plants and animals far from their native lands and carried water over enormous distances. To purify this water from impurities it would inevitably acquire through its long
Neptune is the eighth planet from the Sun and is a much larger world than Earth. Neptune is what astronomers classify as a "gas giant" and has a very different chemical makeup than the Earth possesses.
Resistors are electronic components used to regulate the flow of voltage through specific parts of circuit boards. The more resistance the circuit has, the less voltage is allowed to pass through it. Circuits are usually configured in parallel, in series, or a combination of both. In basic terms, a
Chromatography is a laboratory process used to separate mixtures by the absorbency of their individual components, according to Princeton University's WordNet Search. There are many forms, including paper, thin-layer and column chromatography. One type of column chromatography is High Performance Li
Alternating current, or AC, is the kind of electricity that comes into your house. Many devices, such as radio, TV and computers, need direct current, or DC. The solution is the power supply. This is a series of circuits that convert AC to DC. Power supplies typically consist of three stages: transf
Solar power is becoming an ever more popular alternative energy source, both in terms of larger power generating plants and through solar panels on the roofs of private homes. What confuses many people is the different techniques used by the different types of solar panels. Although both photovoltai
Deltas form where a river enters a larger body of water or a broad basin. Losing some of its capacity to carry sediments as its gradient decreases and its channel widens, the river deposits its load, building deltas of various shape from these materials. The existence of a delta attests to a substan
Mosquitoes are a nuisance to any camper. Not only do they cause itchy bites and red welts, but they carry and transmit dangerous diseases like malaria, encephalitis and the West Nile virus. As a precautionary measure, anyone living or traveling through areas where they may be exposed to mosquitoes
The eating habits of animals fall in to three groups. Herbivores eat only plants. Zebras, buffaloes, gorillas and horses are examples of herbivores. Omnivores such as ravens, squirrels and human beings eat both plants and animals. Carnivores eat meat only. Carnivores sit at the top of the food chain
Leather is a sturdy and hard-wearing natural material that can be transformed into clothing, outerwear, accessories and furnishings. A lot of leather goods have a rustic handmade charm which they receive from the old-fashioned hand sewing techniques used to bind them. This method is relied upon sinc
The word photovoltaic comes from words meaning light and electricity. So photovoltaic (PV) panels earn their name by converting light to electricity. Specifically, solar PV converts sunlight to electricity. There are several different types of solar PV, but all of them are made from semiconductors.