Old Tray, New Tricks: Windows 7's Taskbar and window
management tweaks are nice. But its changes to the
System Tray - aka the Notification Area - have a huge
positive effect.

Changes in Windows 7 transform the System Tray from
an intrusive eyesore (in Windows Vista) into a useful set of
shortcuts and other controls.
In the past, no feature of Windows packed more
frustration per square inch than the System Tray. It quickly grew
dense with applets that users did not want in the first place, and
many of the uninvited guests employed word balloons and
other intrusive methods to alert users to uninteresting facts at
inopportune moments. At their worst, System Tray applets
behaved like belligerent squatters, and Windows did little to put
users [PARTICLE] in charge.
In Windows 7, applets can't pester you unbidden
because software installers can't dump them into the System
Tray. Instead, applets land in a holding pen that appears only
when you click it, a much-improved version of the overflow area
used in previous incarnations of the Tray. Applets in the pen
can't float word balloons at you unless you permit them to do so.
In Windows 7, applets can't pester you unbidden
because software installers can't dump them into the System
Tray. Instead, applets land in a holding pen that appears only
when you click it, a much-improved version of the overflow area
used in previous incarnations of the Tray. Applets in the pen
can't float word balloons at you unless you permit them to do so.
It's a cinch to drag them into the System Tray or out of it again,
so you enjoy complete control over which applets reside there.
More good news: Windows 7 largely dispenses with the
onslaught of word-balloon warnings from the OS about
troubleshooting issues, potential security problems, and the like.
A new area called Action Center - a revamped version of Vista's
Security Center - queues up such alerts so you can deal with
them at your convenience. Action Center does issue
notifications of its own from the System Tray, but you can shut
these off if you don't want them pestering you.
All of this helps make Windows 7 the least distracting,
least intrusive Microsoft OS in a very long time. It's a giant step
forward from the days when Windows thought nothing of
interrupting your work to inform you that it had detected unused
icons on your desktop.

(Adapted from
http://www.pcworld.com/article/172602/windows_7_review.html)

Read text II and answer questions 34 to 40.
Meet the new neighbours

          What are the best energy sources? "Best" depends
     on many factors - how the energy is being used, where
     it is being used, what energy sources are available,
     which sources are most convenient and reliable, which
5   are easiest to use, what each costs, and the effects on
     public safety, health, and the environment. Making smart
     energy choices means understanding resources and their
     relative costs and benefits.
          Some energy sources have advantages for specific
10  uses or locations. For example, fuels from petroleum
     are well suited for transportation because they pack a
     lot of energy in a small space and are easily transported
     and stored. Small hydroelectric installations are a good
     solution for supplying power or mechanical energy close
15  to where it is used. Coal is widely used for power
     generation in many fast-developing countries - including
     China, India, and many others - because domestic
     supplies are readily available.
          Efficiency is an important factor in energy costs.
20  How efficiently can the energy be produced, delivered,
     and used? How much energy value is lost in that process,
     and how much ends up being transformed into useful
     work? Industries that produce or use energy continually
     look for ways to improve efficiency, since this is a key to
25  making their products more competitive.
          The ideal energy source - cheap, plentiful, and
     pollution-free - may prove unattainable in our lifetime,
     but that is the ultimate goal. The energy industry is
     continuing to improve its technologies and practices, to
30  produce and use energy more efficiently and cleanly.
          Energy resources are often categorized as
     renewable or nonrenewable.
          Renewable energy resources are those that can be
     replenished quickly - examples are solar power,
35  biomass, geothermal, hydroelectric, wind power, and
     fast-reaction nuclear power. They supply about seven
     percent of energy needs in the United States; the other
     93 percent comes from nonrenewables. The two largest
     categories of renewable energy now in use in the U.S.
40  are biomass - primarily wood wastes that are used by
     the forest products industry to generate electricity and
     heat - and hydroelectricity.
          Nonrenewable energy resources include coal, oil,
     natural gas, and uranium-235, which is used to fuel
45  slow-reaction nuclear power. Projections of how long a
     nonrenewable energy resource will last depend on many
     changeable factors. These include the growth rate of
     consumption, and estimates of how much of the remaining
     resources can be economically recovered. New exploration
50  and production technologies often increase the ability of
     producers to locate and recover resources. World
     reserves of fossil energy are projected to last for many
     more decades - and, in the case of coal, for centuries.

In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html