In what year was Dutch-American mathematician Tjalling Koopmans born: 1901, 1910, 1915 or 1924?

After the San Francisco earthquake and fire of 1906, architect Julia Morgan was called upon to rebuild the interior of which San Francisco hotel?

Who was Madonna married to from 1985-1989?

What are the first names of thumbs-up movie critics Siskel and Ebert?

Can you name the twin sisters whose rival advice columns ran in hundreds of newspapers throughout the English speaking world?

Which game is played on a marked board divided into two halves, each side containing 12 alternately colored points?

This African-American botanist and agricultural chemist developed hundreds of uses for peanuts, soybeans, and sweet potatoes. Who was he?