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Tooth enamel is laid down in daily increments, with darker bands accumulating about once a week.
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Maximal Heart Rate Over Time
In middle childhood, children spend increasing amounts of time with peers and friends.
To cleanse an open wound, begin close to the wound and work outward in full or half circles.
Physics: Power, Energy and Time