Comment: Re:Arrogant to presume no life. (Score 1) 230
No, I suggested correlation, not causation, between intelligence and radio waves. Much fewer people were thinking about new inventions partly as a consequence of the species as a whole being less intelligent. Fewer peaks in individuals than now, and far lower troughs among the majority. There are more people today smarter than all but the smartest of the 1890s, partly because we have so many more people but also because we have so many smarter and more smart.
Education and technological tools for amplifying the intellect have indeed changed the species to a more intelligent one. As has culture, partly from the economic pressure to survive using tools that both enhance intelligence and demand more of it.
If we were to discover aliens that had a lot of potential to be intelligent, but just swam around photosynthesizing in the daylight all day, we wouldn't be impressed. We're looking for fellows to learn from, not just about like another animal. It's the information that intelligent aliens would have that's attractive. Most 1700s humans on Earth were pretty dumb.