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Various items (hot dogs, bananas, flowers, racquetballs, plastic cups) show properties akin to glass when chilled in liquid nitrogen.^1-4 Objects such as racquetballs and plastics behave in this manner because they are made of polymers, and polymers can become cooled below what is known as the glass transition temperature (T_g) for t

Co-Authored by Dean J. Campbell* and Bozana Lojpur* *Bradley University, Peoria, Illinois

I have just finished teaching bonding to my chemistry classes and was reminded of a brilliant stamp that I have from Russia (technically at the time it was the Soviet Union) that showcases a quadruple bond. Yes you read that right!

Many of you who know my work are aware that I have many different, let’s call them" eccentric", approaches to my teaching. One of them that I want to start talking about here on ChemEd X is Chemistry (and occasionally physics) on Postage Stamps.

Bill Hammack- never heard of him, right? I love his videos as he dissects the physics and chemistry of how things work. Nothing fancy or gimmicky. Just good ol' experimentation, acute observation, rational deduction, and contagious curiosity.  

If you didn't know, National Periodic Table Day is this Thursday, Feb. the 7th. More info about the day can be found on PeriodTableDay.org.