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Jean SenebierDied 22 Jul 1809 at age 67 (born 6 May 1742).Swiss naturalist and botanist who demonstrated that green plants consume carbon dioxide and release oxygen under the influence of light. In 1788, Jean Senebier, in his Expériences sur l'action de la lumière solaire dans la végétation established the relationship between the presence of carbon dioxide in the atmosphere and the production of oxygen by plants. His studies built on the work of Ingenhousz who showed that plants produce oxygen in sunlight and carbon dioxide in darkness. Neither scientist fully understood the puzzle of photosynthesis, but they provided steps to the solution by others after them.
While the bar patron savored a...
"I'm celebrating, too," she replied, clinking glasses with him.
"What are you celebrating?" he asked.
"For years I've been trying to have a child," she answered, "Today my gynecologist told me I'm pregnant!"
"Congratulations," the man said, lifting his glass. "As it happens, I'm a chicken farmer, and for years all my hens were infertile. But today they're finally fertile."
"How did it happen?"
"I switched cocks."
"What a coincidence," she said, smiling.