"The reality is, the way we've used phones and the amount that we've used phones has changed radically in the past five years. When phones were first marketed in the 1990s, it cost, for car phones, $3000 to buy a phone and the average person did not use it that much. They were very, very expensive."

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The average person's short-term memory can hold only five to seven bits of data at any one moment. If you put more items in, others fall out. The older you are, the more you have crammed into those memory circuits. Twenty-five-year-olds can remember things because they still have empty space. Some of us take our children to the supermarket in the hope they will remember why we are there.

— Jennifer James