If you've accumulated a collection of wooden rulers or spotted some at thrift stores, you can use them to make all sorts of ...

Perhaps most infamously, the pattern played out one year ago Sunday in Ferguson, Mo., where a white police officer searching for a convenience-store robber shot and killed an unarmed black teenager.

One of the earliest instances of black and Latino students being bused to predominantly white schools was in the 1950s, Delmont said. New York tried to reduce overcrowding in predominantly black ...