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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Most Common Use of Time, By Age and Sex
Typical time use varies by who you talk to. This interactive shows you the differences when you vary age and sex.
Oldest, Youngest, and Middle Children, in Differently Sized U.S. Households
I looked at the percentages of people with a given number of kids in the family and the order they were born.