... tool for astronauts in outer space. It is now a very helpful tool for cleaning our homes. The pacemaker is a form of life-support on spacecrafts, helping astronomers' hearts pump while they are outside of the Earth's atmosphere. It is used, on Earth, for those who's hearts have problems with pumping blood. Pens that write upside-down are used in space, where there is no gravity and writing with pens would otherwise be impossible. They are convenient tools on Earth when we are trying to write on vertical surfaces. A zero-gravity training system is used to help astronauts become more comfortable with the conditions in space. It is used in places such as Sport ...
Words: 377 - Pages: 2
... As the goals of the project were made clearer, our group began discussing possible ideas for the design. There were some disagreements about whether we should take the electromechanical route or the purely electrical one. And after some deep thought, we all agreed that the mechanical way would be the simplest to build and the most merciful on our pocketbooks. Even though we were coming up with some good ideas, each design seemed to contain some major problems. One of the reoccurring problems dealt with the synchronization of the driver motor and the steering system. Finally the team came up with a design that allowed the drive and steering controls to be inde ...
Words: 594 - Pages: 3
... NO2 and NO3, collectively called NOx). These gases are produced almost entirely from burning fossil fuels, mainly in power satations and road transport. (Kucera, (1973) The Challenge of Ecology, The Mosby Company.) Tremendous quantities of this nitric acid and sulfuric acid mix are reflected in the lowering of the acidity of rain. Earthworms (Annelids) are a species of worm which are many segmented. They live in damp soil, usually forming intricate tunnels beneath the surface. Their bodies are lond and cylindrical, and have "bluntly tapered ends and are somewhat depressed posteriorly." (Storer, et. al, (1972) General Zoology 5th ed., McGraw Hill Books.) As earth ...
Words: 641 - Pages: 3
... a neutron, a subatomic particle with no electrical charge, strikes the nucleus of one of these isotopes and causes it to split apart. When the nucleus is split, a large amount of energy is produced, and more free neutrons are also released. These neutrons then in turn strike other atoms, which causes more energy to be released. If this process is repeated, a self-sustaining chain reaction will occur, and it is this chain reaction that causes the atomic bomb to have its destructive power (World Book, 1990). This chain reaction can be attained in two different ways. The first type of atomic bomb ever used was a gun-type. In this type two subcritical pieces of U-23 ...
Words: 2095 - Pages: 8
... such other gases as ethane acetylene, and phosphine. has an average temperature of negative one hundred and seventy six degrees Celsius below zero. On the surface of planet winds can reach up to nine hundred mile per second. also has a jet stream. 's magnetosphere consuts of a set of doughnut-shaped radiation belts in which electrons and atomic nuclei are trapped. The belts extend more than two million kilometers from the center of and even farther in the direction away from the sun, although the size of the magnetosphere fluctuates, depending on the intensity of the solar wind. like Jupiter has many storm systems on the planet. From Earth appears to be a yell ...
Words: 568 - Pages: 3
... suggested with a frog embryo and egg. Unfortunately, the frog egg did not develop. (Specter/Kolata) That same year, researchers in Pennsylvania cloned a live frog. The technique used was known as embryo twinning, or causing the embryo to split apart. It is much easier to clone with embryonic cells. Much later, mammals such as sheep were cloned using this process. (Nash 64) In 1970, John Gurdon repeated the procedure suggested by Hans Spemann. This time, the experiment yielded partial success. The tadpoles were born alive, but they died when they began to feed. He showed that transplanted nuclei reverted to an embryonic state. In the early 1980's, there was som ...
Words: 1910 - Pages: 7
... chemicals and substances are no longer belched into the environment. For example, Sagan is right on the mark when he indicates that it took the reality that CFCs were destroying the sensitive but protective ozone layer to encourage large chemical companies to begin a gradual phase-out of these substances, even when scientists had already discovered the terrible effects of the chemical combination. Sagan says that to slowly stop usage of such obviously dangerous substances is not enough, for even with current conditions, it is estimated that the damaged ozone layer will require at least 100 years to repair itself. In the interim, we are risking danger to the food c ...
Words: 2080 - Pages: 8
... expect Earth's temperature to increase by any-where from three to nine degrees. The Vostok record confirms that," says Harte. The grid is divided into ten sections. Each of the ten sections covers thirty square yards of the meadow. The infarared lamps will heat every other section by 2.5 degrees. The unheated sections in between allow researchers to compare the efects of the lamps with the regular state of the meadow. One time a week, Harte will take gas samples from buckets turned upside down for ten minutes at a time on both the heated and unheated strips through fitted nipples at the bottoms of the buckets by syringes, then analyze them with a gas ...
Words: 504 - Pages: 2
... of MS.2 There is evidence of a slight increase in MS among first degree relatives--parents, siblings, and children. It is also suspected that the same family members may inherent a genetic susceptibility to MS. While it is possible to inherit a genetic susceptibility to MS, it is not possible to inherit the disease. And even people who have all the necessary genes don't necessarily get MS. The disease, experts believe, must be triggered by environmental factors. So MS is not considered a hereditary disease.3 Until the definite cause of Ms is proved the treatment cannot be truly scientific. But there are treatments that are effective in dealing with symptoms. ...
Words: 1939 - Pages: 8
