An in-depth discussion of tear gas.

  chemistry protests tear_gas explanation chemical_weapons resources twitter medicine biology

Before I repost this Twitter thread in toto, I'd like to say a few things.  First, Zander is an old friend of mine (pushing 20 years at this point).  Second, while he might bill himself as "an amateur chemist," his scientific expertise has been helpful to me numerous times over the years, so I feel that I can vouch for his knowledge as well as his assessment of the situation.  I asked him if I could repost this research earlier and he gave his permission.  For clarity I've made minor edits to add punctuation.  I've also reposted the images he …

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Reprint: Making your own superconductor.

  chemistry howto reprint supercooling omni_magazine superconductors materials-science science

Disclaimer: Times have changed since this article was written so seek legal and scientific advice from qualified personnel if you plan to try making your own superconducting materials.  I am not qualified personnel or a lawyer.  Do not try this at home.  We live in a world in which possession of basic chemistry apparatus is illegal in some places, so do your homework.

Process reprinted from OMNI Magazine, November 1987, page 76.  (local PDF) (local CBR) (right-click -> save as to download))

From How To Make Your Own Superconductors, by Bruce Schecter.  Retyped as faithfully as possible.  Hyperlinks mine, added for …

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Pulling 3D objects out of liquid, simplifying chemical synthesis, and Autodesk open sources its 3D printing feedstock

  3d_printing chemistry fabrication feedstock liquids open_source synthesis

3D printing anywhere but in heavy industry comes with a whole host of common complaints that have given it something of a negative reputation. Fabbed objects require additional detailing to get rid of the ridges and imperfetctions (true), you can't really print entirely hollow objects because internal structure has to be in place to support the upper surfaces (also true), a lot of hacks have to be done to the printer to make them more reliable (true... heated beds come to mind)... there are others but I'll spare the electrons. In fact, I think I'll cut to the chase and …

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