Recent advances in science and technology have made it
possible for geneticists to find out abnormalities in the unborn foetus and
take remedial action to rectify some defects which would otherwise prove to be
fatal to the child. Though genetic engineering is still at its infancy,
scientists can now predict with greater accuracy a genetic disorder. It is not
yet an exact science since they are not in a position to predict when exactly a
genetic disorder will set in. While they have not yet been able to change the
genetic order of the gene in germs, they are optimistic and are holding out
that in the near future they might be successful in achieving this feat. They
have, however, acquired the ability in manipulating tissue cells. However,
genetic mis-information can sometimes be damaging for it may adversely affect
people psychologically. Genetic information may lead to a tendency to brand
some people as inferiors. Genetic information can therefore be abused and its
application in deciding the sex of the foetus and its subsequent abortion is
now hotly debated on ethical lines. But on this issue geneticists cannot be
squarely blamed though this charge has often been leveled at them. It is mainly
a societal problem. At present genetic engineering is a costly process of
detecting disorders but scientists hope to reduce the costs when technology
becomes more advanced. This is why much progress in this area has been possible
in scientifically advanced and rich countries like the U.S.A., U.K. and Japan.
It remains to be seen if in the future this science will lead to the
development of a race of supermen or will be able to obliterate disease from
this world.
Which of the following is the same in meaning as the word ‘obliterate’
as used in the passage?
Chocolate – there’s nothing quite like it, is there?
Chocolate is simply delicious. What is chocolate? Where does it come from?
Christopher Columbus was probably the first to take cacao
beans from the New World to Europe in around 1502. But the history of chocolate
goes back at least 4,000 years! The Aztecs, who lived in America, through that
their bitter cacao drink was a divine gift from heaven. In fact, the scientist
Carolus Linnaeus named the plant Theobroma, which means “food of the gods”
The Spanish explorer Hernando Cortex went to America in
1519. He visited the Mexican emperor Montezuma. He saw that Montezuma drank
cacao mixed with vanilla and spices. Cortez took some cacao home as a gift to the
Spanish King Charles. In Spain, people began to drink Cortez’s chocolate in
drink with chili peppers. However, the natural taste of cacao was too bitter
for most people. To sweeten the drink, Europeans added sugar to the cacao
drink. As a sweet drink, it became more popular. By the 17th
century, rich people in Europe were drinking it.
Later, people started using chocolate in pastries, like pies and cakes. In 1828, Dutch chocolate
makers started using a new process for removing the fat from cacao beans, and
getting to the center of the cacao bean. The Dutch chocolate maker Conrad J.
Van Houten made a machine that pressed the fat from the bean. The resulting powder
mixed better with water than cacao did. Now, some call van Houten’s chocolate “Dutch
chocolate.”
It was easy to mix Dutuch chocolate powder with sugar. So
other chocolate makers started trying new recipes that used powdered chocolate. People started
mixing sweetened chocolate with cocoa butter to make solid chocolate bars. In
1849, an English chocolate maker made the first chocolate bar. In the 19th
century, the Swiss started making milk chocolate by mixing powdered milk with
sweetened chocolate. Milk chocolate has not changed much since this process was
invented.
Today, two countries – Brazil and Ivory Coast – account for
almost half the world’s chocolate. The United States imports most of the
chocolate in the world, but the Swiss eat the most chocolate per person. The
most chocolate eaten today is sweet milk chocolate, but people also eat white
chocolate and dark chocolate.
Cocoa and dark chocolate are believed to help prevent heart
attacks, or help keep from happening. They are supposed to be good for the
circulatory system. On the other hand, the high fat content of chocolate can
cause weight gain, which is not good for people’s health. Other health claims
for chocolate have not been proven, but some research shows that chocolate
could be good for the brain.
Chocolate is a popular holiday gift. A popular Valentine’s
Day gift is a box of chocolate candies with a card and flowers. Chocolate is
sometimes given for Christmas and birthdays. Chocolate eggs are sometimes given
at Easter.
Chocolate is toxic to some animals. An ingredient in chocolate
is poisonous to dogs, cats, parrots, small rodents, and some livestock. Their
bodies cannot process some if the chemicals found in chocolate. Therefore, they
should never be fed chocolate.
Who made the first powdered chocolate?
On January 3, 1961, nine days after
Christmas, Richard Legg, John Byrnes, and Richard McKinley were killed in a
remote desert in eastern Idaho. Their deaths occurred when a nuclear reactor
exploded at a top-secret base in the National Reactor Testing Station (NRTS).
Official reports state that the explosion and subsequent reactor meltdown
resulted from the improper retraction of the control rod. When questioned about
the events that occurred there, officials were very reticent. The whole affair,
in fact, was discussed much, and seemed to disappear with time.
In order to grasp the mysterious
nature of the NRTS catastrophe, it help to know a bit about how nuclear
reactors work. After all, the generation of nuclear energy may strike many as
an esoteric process. However, given its relative simplicity, the way in which
the NRTS reactor functions is widely comprehensible. In this particular kind of
reactor, a cluster of nine-ton uranium fuel rods are positioned lengthwise
around a central control rod. The reaction begins with the slow removal of the
control ro, which starts a controlled nuclear reaction and begins to heat the
water in the reactor. This heat generates steam, which builds pressure inside
the tank. As pressure builds, the steam looks for a place to escape. The only
place this steam is able to escape is through the turbine. As it passes through
the turbine on its way out of the tank, it turns the giant fan blades and
produces energy.
On the morning of January 3, after
the machine had been shut down for the holidays, the three men arrived at the
station to restart the reactor. The control rod needed to be pulled out only
four inches to be reconnected to the automated driver. However, records
indicate that Byrnes yanked it out 23 inches, over five times the distance
necessary. In milliseconds the reactor exploded. Legg was impaled on the
ceiling; he would be discovered last. It took one week and a lead-shielded
crane to remove his body. Even in full protective gear, workers were only able
to work a minute at a time. The three men are buried in lead-lined coffins
under concrete in New York, Michigan, and Arlington Cemetery, Virginia.
The investigation took nearly two
years to complete. Did Byrnes have a dark motive? Or was it simply an accident?
Did he know how precarious the procedure was? Other operators were questioned
as to whether they knew the consequences of pulling the control rod out so far.
They responded “Of course! We often talked about what we would do if we were at
a radar station and the Russians came.
“We’d yank it out.”
Official reports are oddly
ambiguous, but what they do not explain, gossip does. Rumors had it that there
was tension between the men because Byrnes suspected the other two of being
involved with his young wife. There is little doubt than he, like the other
operators, knew exactly what would happen when he yanked the control rod.
According to the paragraph 2,
which of the following is directly responsible for energy production?