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THE SCIENTIFIC METHOD

THE SCIENTIFIC METHOD. Blown Away Head Lice Meet Hair Dryer of Death. Head lice are becoming indestructible. A study found as many as 80% of the bugs are resistant to insecticides in over-the-counter shampoos, and resistance will only increase. Evolutionary biologist Dale Clayton may

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THE SCIENTIFIC METHOD

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  1. THE SCIENTIFIC METHOD

  2. Blown AwayHead Lice Meet Hair Dryer of Death Head lice are becoming indestructible. A study found as many as 80% of the bugs are resistant to insecticides in over-the-counter shampoos, and resistance will only increase. Evolutionary biologist Dale Clayton may have a new line of attack. Clayton, who usually studies lice on bird feathers, stumbled onto his solution after a major research setback. When he moved his laboratory from England to the University of Utah a decade ago, his entire louse collection perished in the dry desert air. Soon after, his 8-year-old came home from school with head lice. He wondered if human head lice could also be killed by drying them out. “It was sort of a forehead slapper,” Clayton says. After conventional hair dryers failed, Clayton came up with the LouseBuster, a 10-pound device resembling a vacuum cleaner that desiccates (dries out) the bugs with a jet of 140-degree air (140° F). “It’s a pretty brutal assault,” he says. Tests show the invention is both safe and effective, eradicating 80% of live lice and 98% of eggs, leaving survivors unable to breed. And, Clayton says, “it will be awfully hard for lice to develop resistance.” Source: Emily Saarman, “Blown Away-Head Lice Meets Hair Dryer of Death,” Discover Magazine,February 2007

  3. STEPS • 1. State the problem. • In the form of a question • 2. Formulate a hypothesis. • Write as an “If….then….because…” statement.

  4. 3. Test the hypothesis with a controlled experiment. • Parts: • Be sure to use a large sample size • Control Group: gives the basis for comparison • Ex. • Experimental Group: tests ONE SPECIFIC variable • Ex. • Independent Variable: the condition that is changed by the scientist • Ex. • Dependent Variable: the condition that results from the change • Ex.

  5. 4. Make observations • Examine and describe using your senses. • Collect and record data/information • An OBSERVATION is determined using the senses (sight, sound, taste, hearing, touch) and instruments (microscopes, thermometers). • Ex. • An INFERENCE is an interpretation of your observations. • Ex.

  6. 5. Come to a conclusion, based on prior knowledge and data collected. • Ex. • 6. Experiment MUST be repeatable to verify data and ensure accuracy.

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