Express the polar equation \(r=\cos 2\theta\) in rectangular coordinates. Find the maximum height above the \(x\)-axis of the cardioid \(r=1+\cos \theta\text{.}\) Sketch the graph of the curve whose ...

In 1900, less than 10% of families owned a stove, or had access to electricity or phones, and the Model-T was still a full decade away This is the last episode in The Atlantic's trilogy on household ...

Imagine you lined up every human being in the world by income, divided them into 100 groups ("percentiles") ranging from lowest to highest, and asked: How has the last generation of economic growth ...

Your college major has a bigger effect on your income than where you go to college. We reported on this story last month, and ran a graph of the most and least lucrative college majors. But the graph, ...