These are great, especially:

For women, an increase in personal grooming time is associated with lower earnings; for example, if a nonminority woman doubles her daily grooming from 45 minutes to 90 minutes, her earnings drop an average of 3.4%

and:

Activating a positive superstitious belief can boost people’s confidence, which in turn improves performance: In an experiment, a dexterity task that normally took more than 5 minutes was accomplished in just over 3 minutes, on average, if participants were wished good luck before they started it

So now that I know this, do I still want people to wish me luck?