Filed under: editorial, history, math, science —
Tags: agriculture, air conditioner, Alexander Graham Bell, antiseptics, Candice Millard, James Garfield, metal detector, Political Science, politics, Pythagorean theorem —
Tags: agriculture, air conditioner, Alexander Graham Bell, antiseptics, Candice Millard, James Garfield, metal detector, Political Science, politics, Pythagorean theorem —