Dullahans are demi-humans whose heads are separate from their bodies. Naturally, Tetsuo is intrigued by the unique traits of dullahans, but Kyouko is just as interested in learning more about her own body. Tetsuo has the idea to ask the opinion of someone outside of his own background in biology, so he takes Kyouko to meet Souma, an old college buddy.
observation wasn't considered a 
sufficient cause of phenomena.
.لم تكن الملاحظة تُعتبر سببًا كافيًا للظّواهر
Beobachtungen nicht als
ausreichende Ursache für Phänomene.
non era considerata un motivo sufficiente
per il verificarsi di un fenomeno fisico.
a observação não se fazia causa 
suficiente de um fenômeno.
наблюдение не считалось причиной
для возникновения явления.