1. We can understand scrambled sentences as long as the first and last letters are in the right place. This is because our brains are able to fill in the gaps and make sense of the words even if they are in the wrong order.

2. People who are good at sarcasm have healthier minds. This is because sarcasm requires a high level of cognitive function and the ability to understand social cues.

3. People who have a deep sense of guilt are better at identifying the emotions and concerns of the people around them. This is because guilt is a social emotion that requires us to be aware of the needs and feelings of others.

4. Yawning is contagious, even if you're not tired. This is because yawning is thought to be a way of communicating empathy and bonding with others.

5. Our minds wander 30% of the time. This means that for about a third of our waking hours, we're not paying attention to what's happening in the present moment.

6. Eye pupil size can increase by 45% when we look at someone we love. This is because our pupils dilate in response to strong emotions, such as love, attraction, and arousal.

7. We tend to break down knowledge into chunks of 3-4 items. This is why phone numbers and other sequences of numbers are often easier to remember if they're grouped into these smaller chunks.