english: But also imagine if they were filled with solid bone -- our head would be dead weight, we wouldn't be able to hold it erect, we wouldn't be able to look at the world around us.
non_english: Ancak hayal edin, eğer onlar katı kemikle dolu olsaydı, başımız çok ağır olurdu, dik tutamazdık, çevremizdeki dünyaya bakamazdık.