supercomputers
There have been mechanical computers in the past, but they were rare. Today the odds are good that any computer you encounter is digital.
Here are a few examples of the influence of how the cost of materials or manufacturing methods influence the technology those materials and methods are used to create: Rare-earth metals. The rare earths market is important mainly for the production of high strength permanent magnets. These metals are difficult and expensive to separate and work with, and the mining techniques used to obtain them are quite hazardous to the environment. High-precision machining. It takes very expensive dedicated machines to make high-precision machine components such as turbine engine parts. Here like with rare earths, the alloying of metals that make up turbine parts also incur additional cost - more because of the smelting, purification and tempering processes that go into producing the alloys, than the rarity or cost of the alloying elements in this case. Both of these examples involve energy expenditures. Quality has a cost.
Viruses, which are malicious programs, are the biggest computer hazard. Since computers continue to be a rapidly advancing technology, obsolescence is also a hazard. Since computers are electronic devices, there is some electrical hazard as well, although it is rare. If you spill your soup onto a computer, you can expect a short circuit. There are also many specialized hazards associated with the use of computers, such as the various types of frauds that people perpetrate over the internet.
Computers and electronic devices contain a lot of different materials. Some take a long time to degrade naturally (such as metals), others take a very long time to degrade (such as plastics). Most problematic, however, are rare earth metals and heavy metals such as lithium, traces of mercury and similar substances, which can be poisonous when leaking into soil and ground water.
Computers yes, can help the military. I know they help them organiaze missile launches, air strikes etc. They also help to create new generation weaponary for WW3 and other wars, and to orginiaze platoons of soldiers, and design vehicles of War, like Tanks etc.
they are this way because of the same puposes they have and their goal
It is relativley rare to observe a solar eclipse because the sun's light is blocked by the moon
because they are rare
Because they are very rare and endangered
1,800.00 because it was so rare
Relatively rare, and rather expensive.
They are relatively rare, but they do happen.
relatively common, the fifth most common element in the atmosphere. however, it's concentration is only about 1 part to 65000 parts.
No, diamond is relatively rare.
Because they are rare in nature. Black pearls especially
Most pedigreed kittens sell for around $700. The Havana Brown, being a relatively rare and exotic breed, commands a price premium. My Russian Blue cost me $700 My Havana Brown cost me $900
About 28 dollars :l, that's a shame because their so rare.