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Other projects like AgeGuess [8] focus on the senior demographics and enable the elderly to upload photos of themselves so the public can guess different ages. Lists of citizen science projects may change. For example, the Old Weather project website indicates that as of January 10, 2015, 51% of the logs were completed. [9]
One more thing: When it comes to these applications, it's best to use the standard 3 percent concentration of hydrogen peroxide, which you can find at your local pharmacy.
The experiments described in the instruction manual typically require a number of chemicals not shipped with the chemistry set, because they are common household chemicals: Acetic acid (in vinegar) Ammonium carbonate ("baker's ammonia" or "salts of hartshorn") Citric acid (in lemons) Ethanol (in denatured alcohol) Sodium bicarbonate (baking soda)
Robert Hooke, using a microscope, observes cells (1665). Anton van Leeuwenhoek discovers microorganisms (1674–1676). James Lind, publishes 'A Treatise of the Scurvy' which describes a controlled shipboard experiment using two identical populations but with only one variable, the consumption of citrus fruit (1753).
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