Monthly Archives: October 2010

Kenken-friendly numbers

I messed up a kenken the other day, carelessly forgetting that 2, 3, 4 and 6 are not the only divisors of 12. Later, mulling over my mistake, I realized that it’s the presence of the multiplicative identity that gives … Continue reading

Posted in featured, games, mathematics | 12 Comments

Dotted lines

Where I grew up, a dotted line ran through the neighborhood, just beyond my back yard. On maps, that line marked the boundary between the city of Philadelphia and its inner-ring suburbs. On the ground, it was a racial divide—absolute … Continue reading

Posted in modern life, social science | 1 Comment