1. But it turned out that this "unlearning" was not as complete. When they severed the neural connection between rats cortex and amygdala, the rats became afraid of the rats again. This was because the fear was suppressed by the activity of the cortex, but was still present in the amygdala. In humans with unwanted fears, like batophobia, or fear of heights, the same thing happens. Repeated trips to the top of Empire State building seem to distinguish the fear, but it may come roaring back during the time of stress - when the cortex has other things than soothe an excitable amygdala. 

2. Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person's capacity to act.

3. Aggressive power beats you up, soft power wins you over.

4. Free trait agreement.

5. One noteworthy study suggest negative emotions tend to leak those emotions later in unexpected ways. 

6. It can be hard for extroverts to understand how badly introverts need to recharge at the end of the day. 

7. It can be hard for introverts to understand just how hurtful their silence can be.