Biorhythms 1.1 - The biorhythm theory is based on the assumption that the human body has inner clock or metabolic rythms with constant cycles of time. Currently, three cycles starting at birth in a positive direction are postulated. The 23-day or physical cycle relates with physical vitality, endurance and energy. The 28-day or sensitivity cycle relates with sensitivity, intuition and cheerfulness. The 33-day or cognitive cycle relates with mental alertness and judgement. For each cycle, a day is considered either high, low or critical. Now your Newton can display a two week biorhythm after you input your name, birthdate and date to calculate. Biorhythms also takes advantage of Newton's Assist function! You can write somebody's name into the name field then click on the label, the list is updated with the new names found in the Names File. Then you can select a name from this list to get his birthday.