Our guts can really mislead us. Sometimes, what we think of as our gut is something else, like an outside influence. If you're going to buy an apartment and it smells of freshly baked bread, you're more likely to want to buy it.

If somebody tweets 'I like Coca-Cola,' does that mean that they're actually going to buy Coca-Cola? One can? Two cans? Three cans? If they retweet someone else's Tweet, does that mean they're going to buy it?

Debt vultures are really the scum at the bottom of the pond. These are guys who buy up the debts of the world's poorest countries on the secondary market. You can go buy debts of a country like Peru, for example, at a real discount. Why? Because people think that the debts won't be repaid.

Stress makes us prone to tunnel vision, less likely to take in the information we need. Anxiety makes us more risk-averse than we would be regularly and more deferential.

All of us show bias when it comes to what information we take in. We typically focus on anything that agrees with the outcome we want.

In an age that is sometimes nowadays frightening or confusing, we feel reassured by the almost parental-like authority of experts who tell us so clearly what it is we can and cannot do.