The wind from the sun.

Cheesy and silly, these definitely aren’t Clarke’s greatest hits, but that’s not a bad thing. It’s very much a “you know what you’re getting into” sort of deal

There were some solid stories in this book -- things that seemed totally possible in 2015, perhaps even boringly so, in the case of the solar sail "race." My favorite story was the last one in the book, about a guy who descends into Jupiter's upper atmosphere and describes what he sees, like Thor Heyerdahl's journey across the Pacific Ocean on his balsa wood raft, Kon-Tiki.