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Jack Dorsey’s new app tracks how much grass you’re touching

Sun Day is the second app that the Twitter co-founder has launched in the last week, and it was built using Block’s artificial intelligence assistant, Goose.

Block CEO and Twitter co-founder Jack Dorsey has launched a new app that gives users a rough idea of how much exposure they’ve had to the sun. 

Dorsey shared the “Sun Day” app to his followers on X on Sunday, which, according to its white paper on GitHub, “calculates vitamin D synthesis from UV exposure using a multifactor model based on scientific research.”