Vitamin D. A bone softening disease is rickets.

Walking. The word "walking" is derived from the Old English "wealcan", meaning "to roll".

Bea Arthur. Bea Arthur appeared in the 1974 film "Mame".

Forty Percent. There are about 650 muscles in the human body.

Pyroxidine. Large doses of the water-soluble vitamin B6 are not recommended because it can cause neurological disorders.

Pokemon Go. The number of steps taken in the 2016 Pokemon Go physical activity study equal approximately 143 trips to the moon and back.