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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.)
A questão refere-se ao texto a seguir:
TEXTO II
After decades of trying to protect rapidly shrinking forests, Brazil has launched a digital platform called BVRio, short for Bolsa Verde do Rio de Janeiro (Rio de Janeiro Green Exchange). Growers who have more untouched forest than legally required can sell “quotas,” one hectare at a time, to farmers who fall short for a price determined by supply and demand. Under the rule, growers have to keep a minimum amount of native growth on their properties, ranging from 20 to 80 percent of their land depending on the type of vegetation. The trading platform, launched in December 2012, allows farmers to find and negotiate directly with each other.
TEXT I
The Environmental Pillar of Sustainable Water: Ecological Services
Across the globe, increased demand and water mismanagement have put stress on water services. As a result, there has been a growing societal recognition of the need to look at sustainable solutions that allow for everyone to have access to clean water. There is growing recognition of the importance of ecological services (benefits arising from the ecological functions of healthy ecosystems) as part of a management strategy in new approaches. Ecological services imply that nature can also play a role in providing safe drinking water. Whether through source water protection or natural filtration, the environment can work in concert with technology to provide water in a reasonable, sustainable fashion.
(From: http://www.ncbi.nlm.nih.gov/books/NBK50775/)
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Bento boxes
People in offices in Japan often have a bento at lunchtime.
They do not eat a meal in a restaurant; they eat a bento in the
office. They regularly have a menu for the bentos in the office
and they telephone a bento store with their orders. The people at
bento store make the bentos and take them to all the offices at
about 12p.m.
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