People who opened your link, proved it themselves, and passed it on.
| Tier | What it takes |
|---|---|
| I | 10 people in the chain below you |
| II | 50 people in the chain below you |
| III | 250 people in the chain below you |
| IV | 1,000 people in the chain below you |
| V | 5,000 people in the chain below you |
Start here: one problem
A first name or nickname is all we ask for. No email, no last name, no birthday. For a child under 13, a parent or teacher signs up and sits beside them.
Share
See every badge and how to earn it →
Questions people ask
What do I get for sharing my link?
2 points for each new person who opens it, 40 when someone joins through it and solves their own proof, 20, 10, 5, 2.5 and 1.25 for the generations below them, and 20 more when someone you brought in reaches their own claim. The Share badges run from 1 recruit to 81 and from a chain 2 deep to 13 deep.
Does it cost anything?
No. There is nothing to buy, and no badge, rank or point can be bought. A purchase never fires a trigger.
Sources. National figures are from the National Science Board and the National Center for Science and Engineering Statistics, Elementary and Secondary STEM Education (NSB-2021-1): special tabulations of the High School Longitudinal Study of 2009, tables SK12-28, SK12-27 and K12-5. The study shows that the identity came first and the major followed; it was not an experiment. This campaign asks its members the same four identity questions every 30 days so its own results can be set beside the national ones. County economic types are USDA Economic Research Service County Typology Codes (2025); labor markets are Census commuting zones (2020).