Things I would prefer people in particular jobs to know at the time rather than relying on hindsight

Source: British spy boss ignorant of US torture

• Taxi drivers - the fastest way back to my home
• Celebrities - sexting with glamour models is likely to get reported to the media
• Homeopaths - homeopathy is a load of crap
• Aquarium managers - Killer Whales are called Killer Whales for a reason
• Heads of state - Whether or not a country has weapons of mass destruction