Questões Militares

                           How things work: 100 scientific explanations

      Preservation property has always been important to humans. Historians in the ninth century were the first to record the use of varnish, a protective liquid composed of resins, natural oils, and alcohol, among other ingredients. Furniture makers learned that if they painted coats of the stuff on a piece of furniture or wood floor, it made it impervious to liquids and their damage and shielded it from normal wear and tear. And the makers liked the shine furniture had after it was varnished.

      Varnish comes in many formulations. Some are oil based, using linseed or tung oil, while others are water-based. Varnish cures, or dries, on what it’s painted, creating a glossy, clear film on the surface. Some oil-based varnishes can turn to a yellowish color; water-based varieties do not. Wood must be carefully cleaned and sanded before any varnish is applied. Several coats are often required. All varnishes contain resins — terpenes with five-carbon molecules called isoprenes and also include a drying oil or solvent to reduce drying time.

     Although furniture and flooors are still the most frequently varnished items, the wooden hulls of boats are also often varnished. Clear nail polish, a type of varnish, can be used for countless small fixes: dab small amounts to keep splintered wood from snagging, prevent ink from running, and stop buttons on clothing or screws on sunglasses from coming loose.

           (National Geographic Special Publication “How Things Work” Adapted.)

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Texto 3

Drifting apart: Amazing underwater photos that show the growing gap between two tectonic plates

Tuesday, May 31 2011

(http://www.dailymail.co.uk/sciencetech/article-1385589/
The-growing-gap-Eurasia-North-American-
tectonic-plates.html#ixzz1NxZAFhWp)

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The Big Destructiveness Of The Tiny Bribe

Alexandra Wrage 03.01.2010

    The smallest bribes can be the most vexing. Not suitcases full of money and transfers to offshore accounts, but the thousands of everyday payments people make to Indian building inspectors, Chinese customs officials and Nigerian airport functionaries, just to get things done. They’re payments for routine government services that a government official is legally obliged to perform but for which he’s hoping to skim off a little extra.

    Unlike more serious bribes, these very modest payouts, formally known as “facilitating payments”, are not against the laws of the U.S., Canada, Australia, New Zealand or South Korea, when made abroad. They’re illegal for Great Britain, but the Serious Fraud Office there has taken the extraordinary public position that they’re unlikely to give rise to a prosecution.

    Why don’t governments that lead the fight against large-scale bribery fall in line with what is already the practice of many major companies? They don’t want to outlaw such small-scale graft in foreign places, they say, because they don’t have the manpower to prosecute violators. By that logic, communities with just enough resources to handle murder and armed robbery would give a green light to shoplifting. You’d think a government could at least go after a few high-profile cases to set an example and a precedent. Permitting these smaller payments has to impede the effort to crack down on the larger ones. Companies know this.

    “Facilitating” bribes are not tips. Tipping is voluntary, and you decide to do it after a service has been rendered. You don’t pay it at the outset to induce the waiter to bring the food, and you can always go somewhere else to eat next time should the service be bad.

    Nor are they welfare for underpaid civil servants. If government workers are underpaid, we should compensate them for the cost of customs inspections or airport security by aboveboard means, through taxation and so forth. Payment to individuals not only slows service but also encourages entrepreneurial civil servants to increase their income by creating more and greater obstacles.

    Nor are they a mere distraction from the fight against bigger bribes. Rather, they fuel the problem. Junior officials who look for small bribes rise to higher positions by paying off those above them. Corruption creates pyramids of illegal payments flowing upward. Legalizing the base of the pyramid gives it a strong and lasting foundation.

    Nor are these payments legal where they’re made. They may not be banned by the wealthy countries mentioned above, but they are outlawed in the countries where they’re actually a problem. Do developed countries want to say they wouldn’t tolerate such payments at home but don’t care if they’re made abroad? And since they’re illegal in the countries where they’re paid, companies can’t put them on their books. The classic cover for a bribe is to call it a “consulting fee”, but that is a books and records violation that is illegal in any country.

(www.forbes.com. Adaptado.)