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| NEWSLETTER - JULY 25 |
| Before you look at today's web page, see if you can answer some of these questions about the events that happened on July 25. Some of the names are very familiar. Others will likely stump you. Tickle your curiosity with these questions, then check your answers on today's web page. |
| Quotations for Today |
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| QUIZ |
| Births |
| An English scientist, born 25 Jul 1920, contributed to the discovery of the molecular structure of deoxyribonucleic acid (DNA), a constituent of chromosomes that serves to encode genetic information. Beginning in 1951, she made careful X-ray diffraction photographs of DNA, leading her to suspect the helical form of the molecule, at least under the conditions she had used. When Watson saw her photographs, he had confirmation of the double-helix form that he and Crick then published. She never received the recognition she deserved for her independent work, but had died of cancer four years before the Nobel Prize was awarded to Crick and Watson. Can you name this woman? |
| Deaths |
| A Scottish chemist and manufacturer (1766-1843) began a career in the textile industry in a cloth bleaching business. Meanwhile, trying to find uses for the waste products from gasworks, he developed a method of waterproofing cloth (1823), by pressing together two rubberized layers of cloth. His name remains associated with the raincoat made from such cloth. Can you name this man? |
| Events |
| On 25 Jul of a certain year, a hovercraft crossed the English Channel for the first time. Having been shipped to France by tender, the world's first all metal hovercraft, SR.N1, crossed the Channel between Calais and Dover in 2 hours 3 minutes. In what decade did this first hovercraft crossing of the English Channel take place? |
| On 25 Jul 1909, French aviator Louis Blériot flew in a monoplane on the world's first international overseas airplane flight. Between which two countries did he fly? |
| Answers |
| When you have your answers ready to all the questions above, you'll find all the information to check them, and more, on the July 25 web page of Today in Science History. Or, try this link first for just the brief answers. |
| Fast answers for the previous newsletter for July 24: Amelia Earhart; James Chadwick; the decade including the year 1950; rotary-type printing press. |
| Feedback |
| If you enjoy this newsletter, the website, or wish to offer encouragement or ideas, please write. |
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