21Breakfast
The reason why breakfast isn't served all day at McDonald's is mainly because the grill temperature required to cook beef patties is significantly different from the temperature at which eggs are cooked.
22Penguin eggs
In 1912, three men set out to recover emperor penguin eggs from Antarctica. It was so cold one man’s teeth chattered so violently that they shattered. When he returned to the UK the National History Museum refused to accept the eggs.