Xtend ChemEd X

(e)Xtend ChemEd X looks outside the resources available at ChemEd X to items of interest to the community throughout the internet.

Xtend includes Picks, which includes a short description of books, articles, journals, magazines, and web items that our contributors and staff find interesting, professional development events, tweets, and news feeds.

by Hal Harris
Sat, 03/01/2003 - 00:00

In 1792, the French Academy of Sciences appointed two respected scientists to survey a north-south meridian from Dunkirk to Barcelona, for the purpose of determining the size (and shape) of the earth. Why is this important? Because it would establish an international basis for the meter, foundation of the metric system.

Recent activity: 1 year 11 months ago
by Hal Harris
Sat, 02/01/2003 - 00:00

Many people have difficulty understanding the motivation of scientists for precedence and the recognition it brings. While there are monetary incentives for some of the protagonists in "Acid Tongues", it is more often pride and the acceptance of one's ideas that drove the rivalries of Newton vs. Leibniz, Edison vs. Tesla, Crick and Watson vs. Pauling vs. Franklin and Wilkins.

Recent activity: 9 years 2 months ago
by Hal Harris
Wed, 01/01/2003 - 00:00

Even those of us whose whose biochemistry is a little shaky are likely to know that there are twenty amino acids that form the building blocks of proteins in life on earth. Now even that simple factoid is no longer absolutely true. A group of scientists headed by Peter G. Schultz of the Scripps Research Institute have created a new form of E.

Recent activity: 1 year 11 months ago
by Hal Harris
Sun, 12/01/2002 - 00:00

When I was a kid, my brother and I used to negotiate Saturday Los Angeles traffic on our bicycles in order to get to the Museum of Natural History of Los Angeles, where the great collection of dinosaur bones from the La Brea Tar pits were exhibited.

Recent activity: 9 years 2 months ago
by Hal Harris
Fri, 11/01/2002 - 00:00

We all know that, with the deciphering of the human genome as well as those of other animals, and of plants, that the future will bring a new level of understanding and control of our own heredity. But what can the present level of genetic testing provide? In this story, writer David Duncan has as much determined about his future as you can learn with current technology.

Recent activity: 1 year 11 months ago
by Hal Harris
Tue, 10/01/2002 - 01:00

In 1900, David Hilbert gave an address to the International Congress of Mathematicians that outlined the twenty three most important unsolved problems of mathematics, as he saw them. In "The Honors Class", Benjamin Yandell describes the problems and the very remarkable people who worked on them.

Recent activity: 9 years 2 months ago
by Hal Harris
Sun, 09/01/2002 - 01:00

I usually avoid writing in this space about materials that one might use directly in the classroom, since I am trying encourage teachers to expand their scope. However, this two -volume set recently published by the Royal Society of Chemistry is enough to make me change the rules.

Recent activity: 9 years 2 months ago
by Hal Harris
Thu, 08/01/2002 - 01:00

When nearly a dozen scientists, all in some way associated with research on biotechnology, die within a year of the 9/11 attacks, can it be coincidence? Yes, says Lisa Belkin, author of this excellent article on one of the constants of pseudoscience, the attribution of "cause" to random events.

Recent activity: 1 year 11 months ago
by Hal Harris
Mon, 07/01/2002 - 01:00

It goes without saying (amongst males, at least), that one can never have too many tools. Most of us probably have more screwdrivers than any other tool, both because of their utility and their high vapor pressure (like my reading glasses), and so one needs to buy more in order to make sure that one will be available when needed.

Recent activity: 9 years 2 months ago
by Hal Harris
Sat, 06/01/2002 - 01:00

The usefulness of the Internet for commercial and industrial purposes depends on the ability of individuals and companies to communicate privately, using an intrinsically public medium.

Recent activity: 9 years 2 months ago