Als Luis durch die Zeit sprang

Attention, attention: When time traveling, keep your head and feet attached to your body! Do not exit until you reach your destination! Luis has never given much thought to time travel. First, because it obviously isn't possible at all, and second, who would he even want to visit? But then he finds an old box by the roadside, containing pictures and letters about one of the most famous researchers of the past: Alexander von Humboldt. Who is this strange man? And why does he have the exact same chair as his grandpa? When Luis examines the chair more closely, he is taken by surprise. And suddenly, he finds himself in the researcher's office – a full two centuries before his own time.