IT is somewhat strange that in the article on Ptolemy in the “Penny Cyclopædia,” he is spoken of only as a geographer. His fame is undoubtedly built upon his two great works on astronomy and ...

Researchers have recently managed to decipher the manuscript of the ancient Greek mathematician and astronomer Ptolemy 200 years after its discovery. The manuscript is thought to have been written ...

These drawings, which first appeared in the journal Advances in Protein Chemistry in 1981, became known as ribbon diagrams. Richardson’s drawing style was quickly adopted. Structural biologists ...

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond ...

On the side of the coin on the left is a man's head facing right, with long curly tendrils of hair held in place with an ornamental headband, small dots surround the border. The other side of the coin ...

Inspired by professor of climate science Ed Hawkins' climate warming stripes, the air quality stripes depict particulate matter (PM) concentrations in 176 cities worldwide since 1850. These tiny ...

2nd century Greco-Roman map of the world From Wikipedia, the free encyclopedia Seamless Wikipedia browsing. On steroids. Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your ...

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Features fresh approaches and broad coverage of topics especially suitable for high school and the first two years of college. The volumes in this series are an excellent source of enrichment material ...

Have no fear—affinity diagrams are here to save you from getting overwhelmed by the sheer volume of data you’ve gathered. They’ll help you navigate through and organize your data in an incredibly ...

On the side of the coin on the left are the busts of two men facing right, side by side, both men have tendrils of short curly hair with headbands around their heads, shoulders draped in loose ...

What is a Fishbone Diagram? A fishbone diagram is a cause-and-effect discovery tool that helps figure out the reason(s) for defects, variations or failures within a process. In other words, it helps ...