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Nevena Marinkovic

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Ernst Mach

Died 19 Feb 1916 at age 78 (born 18 Feb 1838). Austrian physicist and philosopher who established important principles of optics, mechanics, and wave dynamics. His early physical works were devoted to electric discharge and induction. Between 1860 and 1862 he studied in depth the Doppler Effect by optical and acoustic experiments. He introduced the "Mach number" for the ratio of speed of object to speed of sound is named for him. When supersonic planes travel today, their speed is measured in terms that keep Mach's name alive. His lifetime interest, however, was in psychology and human perception. He supported the view that all knowledge is a conceptual organization of the data of sensory experience (or observation).

Walk across the lake

At a family gathering, Fred's father, grandfather, and great-grandfather bragged that they had all been able to walk on water to the bar across the lake for their first legal drinks. So when Fred's 21st birthday came around, he rowed out to the center of the lake, stepped out of the boat, and nearly drowned. Fred climbed back in and went to see his grandmother.

"Grandma," he said, "it's my 21st birthday, so why can't I walk across the lake like my father, his father, and his father before him?"

Granny looked kindly into Fred's eyes and said, "Because they were all born in January, and you were born in August."

Joke found on on Ongoing Joke Thread forum, posted on Jun 6, 2013 by DonnaB

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