Reading Comprehension Tests 5-8

Atmosphere of Venus

Data from the Pioneer spacecraft of NASA apparently prove the theory that the high surface temperature of Venus is due to an atmospheric greenhouse effect caused mainly by a blanket of carbon dioxide. Such a greenhouse effect is created when energy in the form of sunlight easily passes through a planet's atmosphere, warms its surface, and is converted to heat radiation that is then held in by the atmosphere from top to bottom. Venus has a relatively thin atmosphere like the Earth's, but Venus' atmosphere consists of more than ninety percent carbon dioxide, compared to less than four percent in that of the Earth. Because of its higher percentage of carbon dioxide, Venus' atmosphere traps much more heat radiation than does the Earth's. Thus, the Venus studies are believed to be important to the understanding of possible adverse effects on the Earth's agriculture that could result from the long-term use of fossil fuels, which add carbon dioxide to the atmosphere.

How Does Brain Work?

Theories about how brain works remain a topic of debate. It is agreed, though, that the hippocampus, a part of the brain, is undeniably important for memory. When we experience something, the information is sent via our senses to the hippocampus, where it is processed. Scientists believe that brain cells called neurons first transform the sensory stimuli we experience into images in our immediate memory. Then, these images are sent to the hippocampus and stored temporarily in short term memory. In the hippocampus information is organized, and it is during this process that parts of the image of our experience fade away. Finally, certain information is then transferred to long term memory in a section in the frontal lobe of the brain known as the cerebral cortex. Scientists think this process may happen while we are sleeping, but exactly how the information is transferred from one area of the brain to another is a mystery.

People With Extraordinary Abilities

Fictional stories about people who have extraordinary abilities have always attracted people's attention. One of them is the story of Vera Petrova, who is able to perceive things with different parts of her skin, and through solid walls. One day she comes into his father's office and puts her hands on the door of a locked safe. Suddenly she asks her father why he keeps so many old newspapers locked away there. Vera's curious talent is brought to the notice of a scientific research institute and she is given a series of tests by a special commission. During these tests she manages to read a newspaper through an opaque screen and then she describes the figures and colors of a picture hidden under a carpet. During all these tests Vera is blindfolded; and, indeed, except when blindfolded she lacks the ability to perceive things with her skin. It was also found that although she could perceive things with her fingers, this ability ceased the moment her hands were wet.

The Bermuda Triangle

The Bermuda Triangle occupies a disturbing and almost unbelievable place in the world's catalog of unexplained mysteries. More than a hundred planes and ships have vanished in this area into the air since 1945, and more than a thousand lives have been lost, without a single body or even a piece wreckage from the vanishing planes or ships having been found. Many of the planes concerned have vanished while in normal radio contact with their base until the very moment of their disappearance, while others have radioed the most extraordinary messages, implying that they could not get their instruments to function, that their compasses were spinning, that the sky had turned yellow and hazy on a clear day, and the ocean, which was calm nearby, didn't look right without further clarification of what was wrong.

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