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While scissors congruence accurately captures the modern algebraic notion of 2D area, things get more complicated in higher dimensions. Maxine Calle

A brief illustrated guide to ‘scissors congruence’ − an ancient geometric idea that’s still fueling cutting-edge mathematical research

This is a story about geometry, algebra and many different dimensions, best read with construction paper, scissors and tape on hand.
The former president boards his plane at Reagan National Airport following his Aug. 3, 2023, arraignment in Washington. Win McNamee/Getty Images

Donald Trump is right − he is getting special treatment, far better than most other criminal defendants

While Trump has received early warnings ahead of indictments and detailed explanations behind the charges, criminal defendants typically get a bare-bones explanation.
Demonstrators hold Confederate flags near the monument for Confederacy President Jefferson Davis on June 25, 2015, in Richmond, Va., after it was spray-painted with the phrase ‘Black Lives Matter.’ AP Photo/Steve Helber

When Confederate-glorifying monuments went up in the South, voting in Black areas went down

The drive to remove Confederate monuments links those monuments to modern racism. An economic historian shows that the intent and effect of those monuments from inception was to perpetuate racism.