Why Are Some Still Using Methylene Chloride to Extract Caffeine?

Methylene chloride, also known as dichloromethane, is a solvent that, compared to water, can do a better job at dissolving certain substances such as grease, paint and caffeine. The so-called non polar solvent is mass-produced. It's used by the fracking and plastic industry and in the production of HFC-32, a widely used replacement for CFCs... Continue Reading →

Themes Common to Chemistry, Biology and Society

It does not often occur to us that there are four common themes shared by chemistry, biology and human societies: unity, continuity, diversity and interaction. Unity There is unity in chemistry because all matter consists of atoms subject to nature’s four forces. With the intake of the appropriate energy, the electrons of any substance, and... Continue Reading →

How the Ju|’hoan Make Poison Arrows

When I was a child, my grandmother taught me how to make arrows from the softwood of a poplar, a tree that was abundant in the woods that we could step into from my backyard. Later in adolescence, biased from the movies that I watched,  I perceived arrows to be "primitive". It is another case... Continue Reading →

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