I'm currently reading Juggler of Worlds by Niven & Lerner. I have read, a while ago, all the Ringworld books and a few other Known Space, so I remember that
the Puppeteers used a Starseed lure to get Outsiders to the humans so they could obtain the hyperdrive technology and defeat the Kzinti.
However, now that I ran into them again in Jugglers of Worlds, I am at a loss as to what Starseeds actually are.
What are Starseeds?
And was this explained somewhere?