R' Hershel Shachter on halacha changing and Daas Torah
R' Shachter has a very interesting shiur on how halacha changes here. He clearly states that we need to believe in science. He also has a shiur on Daas Torah here. He starts off the shiur by saying that Hashem wants diversity of ideas, this is why there were 12 shevatim, they were supposed to provide 12 different approaches to Torah. This is the polar opposite of today's UO society where there is only 1 opinion allowed.
If you don't have time to listen to the whole shiur on Daas Torah listen to the last 3 minutes where he talks about the situation today. Basically he says that he doesn't think that R' Elyashiv and others related to the Agudah are considered to be the Gedolei Hador representing the whole nation. They are certainly big talmidei chachamim and gedolei torah but they are not "the Gedolei Hador" representing the nation and therefore there is no chiyuv on any individual to listen to them unless they are that person's rebbe. You need to listen to your Rebbe/Rav.