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The half life of a species is the time it takes for the concentration of the substance to fall to half of its initial value. In non-exponential decay[ edit ] The term "half-life" is almost exclusively used for decay processes that are exponential such as radioactive decay or the other examples aboveor approximately exponential such as biological half-life discussed below.

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Deep Ignorance This dramatic opening emphasizes the idea that we actually know very little about the universe, compared to what we could know. The lesson includes an opportunity for students to find key terms associated with what science IS and is NOT, and links to an expanded explanation pdf file of why those terms are aligned as they are, especially since many of them are popularly associated in the opposite way!

Working with this helps students to recognize many of their misconceptions about science.

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Numismatics — many coins have the date of their production written on them or their use is specified in the historical record. And science seems to be the most effective tool we have for trying to understand at least some of that vast unknown universe.

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Herbchronology Dating methods in archaeology[ edit ] Same as geologists or paleontologistsarchaeologists are also brought to determine the age of ancient materials, but in their case, the areas of their studies are restricted to the history of both ancient and recent humans. Some of the Important but Lesser Known Features of Science The following ENSI lessons accessed from our " Nature of Science " section could probably be used in a variety of sequences, as their applications to the sub-categories of the nature of science overlap each other to some degree.

In addition, because of its particular relation with past human presence or past human activity, archaeology uses almost all the dating methods that it shares with the other sciences, but with some particular variations, like the following: Written markers[ edit ] Epigraphy — analysis of inscriptions, via identifying graphemes, clarifying their meanings, classifying their uses according to dates and cultural contexts, and drawing conclusions about the writing and the writers.

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The concept of a half-life has also been utilized for pesticides in plants[8] and Absolute dating in biology authors maintain that pesticide risk and impact assessment models rely on and are sensitive to information describing dissipation from plants. Then What IS Science?

The biological half-life of caesium in human beings is between one and four months.

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Not every lesson has to be done, or you could choose others from the Nature of Science Index, but you should do at least one in each of the three categories. Reveal each myth, and get students to explain why it's not true.

For this example, the term half time might be used instead of "half life", but they mean the same thing.

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It was the case of an 18th-century sloop whose excavation was led in South Carolina United States in Make an overhead version, listing in large print the 12 items without the explanation.

There are several criteria, and one of them can be called the "Fair Test". For example, the biological half-life of water in a human being is about 9 to 10 days, Absolute dating in biology though this can be altered by behavior and various other conditions.

Seriation[ edit ] Seriation is a relative dating method see, above, the list of relative dating methods.

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Go here to see how it works. See List of nuclides. How Scientists Pick Better Answers: Fair Tests A very important component of doing science is the ability to pick the better answers.

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Many students may think that just about everything to discover MUST have already been discovered.