Extinction of languages? Is this even important?

Today in my linguistics class we learned about endangered languages. At first i was like, "uhhh ok? and whats soooooo special about keeping languages around that no one knows about?" Well, let me tell you... it is very important. We watched this 20 min video and this guy gave a really cool presentation of all the different languages that are becoming extinct. He talked about many languages aren't even recorded or written down so one they are lost, they are lost forever. And what does a language incorporate you ask? When a language goes down, so does their culture, their technology, and their findings. Findings could include different types of plants and different species that scientists havent even discovered because of the remotness of the places or because of the way these people use the plants and animals. It's crazy learning about all that goes along with a language...if anyone is interested, this video clip lecture is really interesting.