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Flaw detection and characterization with thermographic techniques in graphite polymer composites is often limited by localized variations in the thermographic response. Variations in properties such as acceptable porosity, variations in fiber volume content and surface polymer thickness result in variations in the thermal response that in general cause significant variations in the initial thermal response. These variations result in a noise floor that increases the difficulty of detecting and characterizing deeper flaws. The paper investigates comparing thermographic responses taken before and after a change in state in a composite to improve the detection of subsurface flaws. A method is presented for registration of the responses before finding the difference. A significant improvement in the detectability is achieved by comparing the differences in response. Examples of changes in state due to application of a load and impact are presented.

Presents letters to the editor referencing articles and topics published in previous issues. "An Exercise in Logic," refers the article "India and Peace in Asia," appeared in the issue of August 28. It focused on the diplomatic recognition of a country by other; "The New Equality", which focused on non- segregation and racial equality with reference to white people in the south and elsewhere; "Blind Spot," which focused on review of the book "In Search," by Max Lerner; "Pseudo Therapy," which focused on Martin Gumpert's comments on dianetics.

The article presents an interview with David Hoffmann, an herbalist. When asked about the measures to take by herb consumers to support local businesses and contribute to plant conservation, he affirms that consumers need to educate everyone about the importance of buying products that are green in some way to begin with. Hoffman believes that consumers must empower everyone to think of themselves as regional herbalists when choosing herbs. He contends that the United Plant Savers, an organization, monitors the conservation status of individual herbs.

Focuses on morel mushroom, an edible fungus. Importance of wild foods; Information on a part of the world where morel mushrooms are found; Appreciation of nutrients and taste of morel mushrooms; Method to cook and serve morel mushrooms.

The article reports on the medicinal use of honey in the Neolithic period. It is stated that people living on the Greek island of Crete were making, using and exporting honey-based medicines. They created honey with specific healing properties by locating hives near medicinal plants as they bloomed. In the U.S., the use of honey to treat infections was abandoned in the 1940 when antibiotics became widely available. Moreover, honey can be used to treat other health problems.