What is the 'sunk cost fallacy'? Is it ever a good thing?

Have you ever encountered a subpar hotel breakfast while on holiday? You don't really like the food choices on offer, but since you already paid for the meal as part of your booking, you force yourself to eat something anyway ...

New doubts over coral, safety at planned Olympic surf venue

The president of French Polynesia has questioned whether 2024 Olympic surfing can go ahead at the planned site in Tahiti, saying he was concerned about safety and damage to coral from a planned judging tower.