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Wearable activity and environmental trackers at millimeter scale; pedometers at millimeter scale; wearable computers at millimeter scale in the nature of millimeter scale wireless wearable activity trackers featuring electronic devices to be worn by a human to gather data, for displaying, measuring, and uploading information to cell phones, personal digital assistants, computers and to the Internet, such information including heart rate, global positioning, ultraviolet exposure, distance, altitude, elevation, speed, steps, floors and estimated calories burned; wearable computers at millimeter scale in the nature of millimeter scale wireless wearable activity trackers featuring sensors for scientific use to be worn by a human to gather data and also including one or more accelerometers, heart-rate monitor, ultraviolet light detectors, gyroscopes, pulse oximeters, altimeter, global positioning system tracker