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Companies and individuals are often at odds, concerned either with collecting information or with preserving privacy. Online stores and services are always eager to know more about their customers--income, age, tastes--whereas most of us are not eager to reveal much.

(PhysOrg.com) -- The concept of time as a way to measure the duration of events is not only deeply intuitive, it also plays an important role in our mathematical descriptions of physical systems. For instance, we define an object’s speed as its displacement per a given time