Probably just reading in general. If you watch too much TV you'll legitimately become brainwashed into believing the current culture pushed by Hollywood and a small number of media outlets. It's not good. Those people aren't too bright.
Also, almost no idea on TV has more than a few minutes of thought put into it.
In contrast, some books have years of thought put into them. Big difference.
Protip: Youtube search the authors you're interested in and watch them give speeches and talks. 80% of the same content and you can do it while you eat dinner.
As someone who has read hundreds of books in the last several years, I've found this to be mostly true.
Often times I've had epiphanies while reading. It's usually something smaller that an author says that hits me just right. The problem is, it takes a lot of effort and time to read so much to gain these little insights. Watching an author speak on subject at 1.5x to save even more time is more prudent. I'm sure you can still glean unexpected insights. Focus on return on your invested time. Read for purpose. You should always know the purpose for picking up a book. If it's simply to pass time, well then, who cares. If it's to get ideas and stimulate the mind, find ways to speed that process up. If it's to pick up knowledge, that's the lowest hanging fruit where distilled author discussions or blog posts can save you time.