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JCE ChemEd Xchange provides a place for sharing information and opinions. Currently, articles, blogs and reading lists from ChemEd X contributors are listed below. We plan to include other items that the community wishes to share through their contributions to ChemEd X.

Hal Harris's picture

River Out of Eden: A Darwinian View of Life

Wed, 04/02/1997 - 01:00 -- Hal Harris

The "river" to which Dawkins refers in the title of this little (172 page) book is the river of digital genetic information that connects us to our human ancestors and to the rest of life on our planet. I find this metaphor to be an extremely provocative one, and I suspect that it would appeal to many of our computer-addicted students.

Hal Harris's picture

When Hazy Skies are Rising

Tue, 04/01/1997 - 00:00 -- Hal Harris

If you have students looking for an interesting science project, the May Scientific American has a nice one. A sun photometer can be used to determine the amount of haze in the atmosphere, and this article describes one that can be built in a couple of hours for less than $20 (although you also need to have a voltmeter).

Hal Harris's picture

Teaching Chemistry Embedded in History: Reflections on C. K. Ingold's Influence as Historian and Educator

Sat, 03/01/1997 - 00:00 -- Hal Harris

The Bulletin for the History of Chemistry is the official publication of the American Chemical Society's Division for the History of Chemistry. The most recent issue is dedicated to the contributions of C. K. Ingold, one of the founders of physical organic chemistry. It records the proceedings of a symposium at the ACS meeting in Chicago in 1993.

Hal Harris's picture

Observation of Interference Between Two Bose Condensates

Sun, 02/02/1997 - 01:00 -- Hal Harris

The very first of "Hal's Picks", back in 1995, was the announcement of the first experimental observation of a Bose-Einstein condensate. This can be considered as a new phase of matter, in which atoms in a cold cluster lose their separate identities, because their deBroglie wavelengths exceed the dimension of the group in which they find themselves.

Hal Harris's picture

Enantiomeric Excesses in Meteoritic Amino Acids

Sat, 02/01/1997 - 00:00 -- Hal Harris

The origin of the molecular "handedness" that pervades earth's biology has been an evolutionary puzzle. Given that right and left-handed amino acids have equal energies, why do only the left-handed ones participate in biosynthesis? One hypothesis is that life started from templates that arose from extraterrestrial sources, such as meteors.

Hal Harris's picture

The Demon-Haunted World: Science as a Candle in the Dark

Wed, 01/01/1997 - 00:00 -- Hal Harris

Science lost one of its most eloquent and persuasive spokesmen with the death last month of Carl Sagan. While he was best known as an astronomer and planetary scientist, The Demon-Haunted World should remind us that his interests were far broader than that. Here, he addresses at greater length some questions of pseudoscience that he briefly discussed in Sunday Parade magazine articles.

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