SOLVED!: grand canyon raft trips [s]

[Dennis]

i read a book in the early 1990's about a raft trip down the grand canyon but cannot remember the title.
there were several people on the trip, all of whom were incredibly interesting, intelligent, etc. the main gist of the book was a story about the geology of the grand canyon, astronomy, and other sciences,and these topics were talked about during campfire discussions. thanks

[Kaion]

In the Heart of the Canyon? Too new.

The River That Flows Uphill: A Journey from the Big Bang to the Big Brain?

[Dennis]

dear kaion, that's it! thanks so much.

[Kaion]

You're welcome. :)