Some people see bears on the road everywhere. Others don't worry about anything. But who sees the world more realistically? Who performs better under pressure: worriers, who are afraid of making a fool of themselves, or happy eggs, who avoid all criticism? And can happy eggs also make excuses when things go wrong?

Smartphone addiction is a major social problem. What does it do to you if you sit on Instagram and tiktok all day? Does that give you a shorter attention span? What does it do to your health and your body? And might it also have advantages?

Spirituality is hot. But what does it say about you if you are spiritual? Are you less inhibited compared to your rational fellow man? Are spiritual people perhaps also easier to scam? And who is best to have at your deathbed at the end of your life: someone who thinks very down-to-earth about life and death, or someone who is very spiritual?

Once upon a time, 'nerd' was almost a swear word, but nowadays it is increasingly seen as cool. But how do you recognize nerds? Are nerds less likely to ask for help when they have problems? And are they really that socially awkward? Or are nerds actually just as herd animals as the rest?

How do you change when you have children? Is it easier for people with children to ignore themselves? Do they cry more quickly? And are they better able to complete a difficult task successfully?

What does it say about you if you live above or below the major rivers? Are people with a soft G perhaps more honest? Are people with a hard G really such misers? And is the prejudice that northerners are less sociable than southerners correct?