KNOW ONCE AND FOR ALL WHEN TO PURCHASE ANYTHING!

Mark DiVincenzo says, the concept was his wife's, but everyone will benefit by knowing when and how to do whatever and when:  It is a must for all. 
Her are a few examples of what you can learn:
Exercise for the best results, travel during less traffic.
Ketchup in May because it is the beginning of summer. 
Fly at noon because the traffic to the airport is lighter.
Run between 6 and 8 pm because your muscles are at their peak and so is your flexibility and your blood temperature is high so you have greater endurance in the evening.