Time is a flat circle, Matthew McConaughey tells us, neglecting to explain how then we could measure time's circumference to derive its diameter, using pi. (Maybe it's best not to take the sentiment ...

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Young math teacher kept in touch with her students through Twitter. Colleen Ritzer is seen in this photo released by her family. Courtesy of Ritzer's family Oct. 23, 2013— -- Slain math teacher ...