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Ketchup’s Shear Mystery
Shifting suddenly from a thick paste to a runny liquid when shaken or jarred, ketchup is one of many complex fluids that share a property called “shear thinning.” A NASA Web page highlights an upcoming space experiment aimed at elucidating the basic physics of these fluids. Go to: http://science.nasa.gov/headlines/y2002/07jun_elastic_fluids.htm
- Math
Dangerous Problems
Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve. Nonetheless, despite their reputed difficulty and repeated warnings from those who had failed to solve them in the past, these infamous problems continue to lure mathematicians into hours, days, and even years of futile labor. Billiard-ball trajectory after 15 […]
- Math
Dangerous Problems
Some mathematical problems are easy to describe but turn out to be notoriously difficult to solve.
