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    DAGUERRE PHOTOGRAPHIC SYSTEM
    January 7, 1839 - Académie des Sciences, Paris

    Louis Daguerre made the first announcement of his photographic system at the Académie des Sciences in Paris, though details were not presented until 19 Aug 1839 when the process was announced publicly. By that time, the French government had bought the rights to the process from him, and then made them freely available to the world. However, this process had also been patented in England and Wales on 14 Aug 1839 - only five days previously.

    THERMAL CRACKING PATENT
    January 7, 1913 - U.S. patent (No.1,049,667)

    A U.S. patent for the thermal cracking of crude oil was issued to William Merriam Burton (No.1,049,667). A crude petroleum mixture of various hydrocarbons can be separated into several groups of constituents by physical means, commonly distillation. His thermal cracking process used high heat and high pressure to chemically break longer molecules of less volatile components into smaller molecules, more than doubling the yield of gasoline which was much needed to fuel the motor industry. In its first 15 years of use the process saved more than 1 billion barrels of crude oil. In 1937 the invention of catalytic cracking superseded the Burton process, but it remains in wide use.

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    Myth: Staring at a computer screen all day is harmful to the eyes. Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable.

Artificial Grass and Synthetic Turf Revi :

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For a long time, the use of artificial grass and synthetic turf has been limited to sports stadiums. However, its reach is now extending to home compounds as well. It definitely has its merits as well as demerits.

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By analyzing these ones in relation to those of natural grass can help one make a sound decision about its use.

1. Artificial grass makes it possible to realize a great deal of savings in several ways.

• First, the amount of money invested in laying it out as compared with its durability is reasonable. While making a natural turf is rather inexpensive, its maintenance costs in the end make it more costly than this one.

• Second, the energy efficiency that comes with it cuts back costs significantly. This is notable when one considers the amount of fuel used annually by a simple lawn mower. Time that would be used in carrying out maintenance practices is also saved, making it convenient for the sick or elderly to manage their backyard easily.

• The modern day urban neighborhood has to cut down on water spending and this proves damaging to natural landscapes. Since artificial grass and synthetic turf does not need watering, makes it useful in these areas.

• Replacement costs in high wear and tear regions are avoided with this type of grass. These are areas where children play, dog runs and even around the swimming pool where splashing water can damage a natural lawn. Sporting arenas also enjoy its benefits.

2. Artificial grass and synthetic turf is also an environmentally friendly option.

• First, it needs no pesticides and thus prevents the negative effects of runoff from chemical treated yards.

• The fact that it needs no mowing means a significant reduction of carbon emission into the atmosphere.

• Clippings from cut grass have also been associated with environmental pollution in several ways. Hydrocarbons are released into the atmosphere; the clippings clog drainage pipes and finally end up in rivers and pollute them.

Another benefit associated with this type of grass is the fact that it gives your yard eye appeal all year round. Seasonal changes do not affect this grass and as such, it will never fade to a dull brown.

Nevertheless, artificial grass and synthetic turf has a number of significant disadvantages. First, the production of the grass involves a lot of carbon release into the atmosphere. This cuts down greatly on its environmental friendliness. The process also involves high energy consumption.

Furthermore, even though the grass is highly durable, after a while it needs replacing. The old grass goes to polluting the environment if not well disposed of.

Natural grass though, rids the environment of harmful Carbon Dioxide by absorbing it. It also breaks down pathogens and is thus a suitable option for playground since it has a lower chance of getting them sick. Wastes decompose with time and pose no risk to the environment.

Weighing these factors and assessing the particular needs of an area can help one in choosing correctly between natural grass and artificial grass and synthetic turf.

Artificial grass or synthetic turf is great for home garden. By installing fake grass, home owner can also save money on water bills.

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