Using blobbies with varying traits such as size, speed, and food gathering ability, Primer simulates natural selection in the explainer video below. Blobby.
Natural selection simulation
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Happiness and Health
When one goes down, so does the other. If only there were a way to keep more people healthy.
What Qualifies as Middle-Income in Each State
The meaning of “middle-income” changes a lot depending on where you live and your household size.