Kevin Simler uses interactive simulations to explain how things — ideas, disease, memes — spread through a network. It always looks like concentrated chaos to begin, but then the things infect quickly. Adjust variables, press play, and watch them go.
Interactive explainer for how disease and ideas spread through a network
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How Much We Eat vs. How Much We Need
On average, we use less energy as we age, and so we should eat less. We don’t always adjust soon enough though.