Yes, though it makes sense as majority of Europe and Europe-descended cultures are Indo-Europeans, with Indians and Iranians as the other major cultures.

We know much about Proto-Semitic AND Proto-Afro-Asiatic, thankfully, due to the antiquity of recorded Semitic languages in the Near East. Proto-Austronesian seems to be clear too with the 600+ languages we have access to. Unfortunately the languages between the three (Caucasians, language isolates, Tibeto-Burman, Andamanese, Turko-Mongol-Yeniseian Altaic* sprachbund etc) are much more obscure.

Yeniseian (the originator of such words as Tengri, Kha(g)an, etc) being connected to Native American Apache language was pretty amazing and evidence of the importance of paleo-linguistics in finding out informations about our ancestors