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We are Ari and Max. We grew up in the same Chicago suburb and both spent a lot of time traveling independently, especially in Africa. We built 40k because it's something we've always wanted for ourselves -- a way to remember where we've been and share where we want to go.
We chose the name 40k because the circumference of the earth is 40,000 kilometers (about 25,000 miles -- and that's how the meter was originally defined, as a fraction of the distance around the earth) and it's fun to think about circling the globe.