As more elements were discovered, the table grew and changed layout. For Science Magazine, Jake Yeston, Nirja Desai, and Elbert Wang provide a visual history.
Evolution of the periodic table of elements
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Where Bars Outnumber Grocery Stores
A closer look at the age old question of where there are more bars than grocery stores, and vice versa.
Shifting Incomes for American Jobs
For various occupations, the difference between the person who makes the most and the one who makes the least can be significant.