Biowriter (Biorhythm) Use a handy pull-down menu to enter a birth date and select the month you wish to view. Fully interactive onscreen display shows personal biorhythms for the selected birth date for the selected month. Click any point on the display to get its numerical rating, and/or an interpretation of a significant event. Biowriter displays and prints a full-color one-month graph. Prints full-text interpretation of significant events with recommendations.