There is also a fantastic resource on the different types of beans available and how they are processed - discussing the difference between Arabica and Robusta coffees and a very interesting explanation of how monsooned beans are made.
Still, at the heart of the difference between father and son is something larger than short-term political calculations: The agenda gap also reflects a different conception of the presidency.
String theorists can perhaps afford to take a different tack, because - with all due respect - it doesn't make any practical difference to anyone in the wider world who's right and who's wrong in that particular discipline.