Category Archives: Hardware

Computer User Hygiene

Intro and Tip #1: Computer User Hygiene

Friends, clients, and any guest visitors – Welcome! Here’s a short intro, and then we’ll move on to our first tip. Cool!

Intro: I asked my clients if they would read a website for computer tips by me, and they (likely, “you”), said “Yes”. So – here we are! I hope you’ll have a lot of fun reading these tips, and maybe even learn something useful too.

Your feedback will be appreciated, and will effect the content of this site.

I thought Health Related Tips would be a good topic for the first few tips (things like hygiene, posture, etc). I’ll be adding more tips as we go.

Let’s start!

Tip #1: Computer User Hygiene

Short version: Wash your hands, before and after using computers, and clean your keyboard and mouse every now and then (see below for cleaning instructions). Note: The picture on the right is NOT my office.

Long version: A group of british scientists did a little experiment recently (Click here for the article). After checking out some samples, they found out that the tested offices’ keyboards had more bacteria on them than – can you guess? – the tested toilets in the same offices. (See bottom for links to cited articles).

I have also heard a reasonable theory: possibly a lot of computer related eye distress is caused not by the glaring of the screen, but rather by people rubbing their eyes (before/after typing), not knowing their hands are actually dirty.

The above mentioned scientists reckoned that food bits on the keyboard are the #1 reason for the bacteria (I know *you* would never eat at your computer, and never-ever-ever leave food bits there, right?). Top reason #2 was, presumably, people not washing hands after bathroom breaks. I would add #3 – a few users on one pc, especially if they tend to rub their eyes (or not just their eyes), or has a flu, etc.

So enough with the paranoia! What to do we do!?

Apart from the obvious – wash your hands here and there – here is the “how-to”:

Keep your keyboard nice and clean:

1. Turn off the computer (so you are free to press down letters during cleaning).

2. Crumbs: Flip your keyboard upside down and give it a light shake if there are any crumbs there…

3. Wiping: Use alcohol-based (or just plain soap-based) wipes, tissue or rag. Wipe down the keys and keyboard surface (Not if you have stick-on letters!!!). I recommend you use a damp rag after this. Make sure your wipe is damp, but not drippy. If you get water in your keyboard, it isn’t the end of the world. Just unplug it and leave it upside down a day or two to dry, and it should be fine.

4. New Keyboard: If your keyboard looks like it is “beyond cleanable” (see picture above…), remember that a new one goes for around 50-100 Shekels.

5. Washable keyboards: There are silicone keyboard covers, and even washable keyboards. The silicone keyboards are a bit strange to type on at first, and they stay flat on the table (not raised at an angle) – but – they are handy for those of you have a laptop, and want an external keyboard that can be rolled up and stowed away. They’re also 50-100 Shekels.

5 and a half: There are also high-end dishwasher-safe keyboards, a bit costly, but also useful.

OK, that’s all about keyboard hygiene for now. Next up will be: Posture (so that we can keep our bones and muscles happy as we work).

Wishing you healthy computing!


Strictly, a battery is a collection of multiple electrochemical cells, but in popular usage battery often refers to a single cell.The first electrochemical cell was developed by thephysicist Alessandro Volta in 1792, and in 1800 he invented the first battery — for him, a “pile” of cells.

The usage of “battery” to describe electrical devices dates to, who in 1748 described multiple (early electrical) by analogy to aThus Franklin’s usage to describe multiple Leyden jars predated Volta’s use of multiple galvanic cells. . It is speculated, but not established, that several ancient artifacts consisting of copper sheets and iron bars, and known as may have been galvanic cells.

Volta’s work was stimulated by the Italian anatomist and physiologist , who in 1780 noticed that dissected frog’s legs would twitch when struck by a spark from a , an external source of electricity.In 1786 he noticed that twitching would occur during lightning storms.After many years Galvani learned how to produce twitching without using any external source of electricity. In 1791 he published a report on “animal electricity.”He created an electric circuit consisting of the frog’s leg (FL) and two different metals A and B, each metal touching the frog’s leg and each other, thus producing the circuit A-FL-B-A-FL-B…etc. In modern terms, the frog’s leg served as both the and the , and the metals served as . He noticed that even though the frog was dead, its legs would twitch when he touched them with the metals.

Within a year, Volta realized the frog’s moist tissues could be replaced by cardboard soaked in salt water, and the frog’s muscular response could be replaced by another form of electrical detection. He already had studied the electrostatic phenomenon of which required measurements of electric charge and of electrical potential (“tension”). Building on this experience, Volta was able to detect electric current through his system, also called a . The terminal voltage of a cell that is not discharging is called its(emf), and has the same unit as electrical potential, named ( and measured in, in honor of Volta. In 1800, Volta invented the battery by placing many voltaic cells in , literally piling them one above the other. This voltaic pile gave a greatly enhanced net emf for the combination, with a voltage of about 50 volts for a 32-cell pile.In many parts of Europe batteries continue to be called piles.

Volta did not appreciate that the voltage was due to chemical reactions. He thought that his cells were an inexhaustible source of energy,and that the associated chemical effects (e.g. corrosion) were a mere nuisance, rather than an unavoidable consequence of their operation, as showed in 1834. According to Faraday,(positively charged ions) are attracted to theandnegatively charged ions) are attracted to the

Although early batteries were of great value for experimental purposes, in practice their voltages fluctuated and they could not provide a large current for a sustained period. Later, starting with the , batteries provided more reliable currents and were adopted by industry for use in stationary devices, particularly in telegraph networks where they were the only practical source of electricity, since electrical distribution networks did not exist at the time.These wet cells used liquid electrolytes, which were prone to leakage and spillage if not handled correctly. Many used glass jars to hold their components, which made them fragile. These characteristics made wet cells unsuitable for portable appliances. Near the end of the nineteenth century, the invention of , which replaced the liquid electrolyte with a paste, made portable electrical devices practical.

Since then, batteries have gained popularity as they became portable and useful for a variety of purposes.

Free Satellite TV!

Television that comes through communication satellites is referred to as satellite television. Digital signals are beamed from satellites to users and these are of three primary types: signals received directly by the viewer, that received by local television affiliates for distribution, or reception by headends for distribution through cables.

Of the many satellite TV systems Dish Network and Direct TV are the main players. Both offer \”free\” satellite TV systems for four rooms with a bouquet of other services like over 250 program selections.

What is free to a first time user is the equipment needed to capture the TV signals. Otherwise one has to pay for viewing and choose a package that suits personal requirements. Many companies and online sites offer free services and enticing satellite TV deals but most of these are scams. Beware of traps and believe in the maxim \”nothing in life is for free.\”

Choose a service that has an established reputation and is authorized by Dish Network or Direct TV. The costs and charges must be transparent, and the provider must have a 24 hr customer service in place. Look for a guarantee that ensures a 100% refund if installation fails.

When ads scream \”Free satellite TV or Get a 4-room satellite TV System\” what you are being offered in actuality is enticement. A consumer gets the TV system installed and promotional gifts like a DVD or DVR free. But what you need to understand is that this is where the \”free\” part ends. Every month you will need to pay for programming services. Charges can include: activation fee of US$49.99 and then a monthly cost of about US $19.99 and subscription fees of US$ 31.99- US$86.00 for viewing 60-230 channels. In addition some providers ask for a deposit or prepayment.

So, to get digital viewing pleasure into your home you need to be prepared to spend $32-94 every month to view what is being promoted as Free Satellite TV.

Author: Steve Valentino
Source: Free Articles from