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?

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?

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?

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?

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?