The pocket notebook
A fitness app knows when you sleep, when you walk, and where you went.
It records steps, heart rate, and location many times a minute.
That is a lot of numbers about one person.
Large collections like this are called big data.
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A fitness app knows when you sleep, when you walk, and where you went.
It records steps, heart rate, and location many times a minute.
That is a lot of numbers about one person.
Large collections like this are called big data.