I have read all and recommend them all, but my favorite so far is Hacking Galileo, but Dwellers in the Deep begs for a re-read.
I need to sell another 20 books this month so I can document my Amazon income. I live very cheaply & a little goes a long way.
Buy an ebook for $3, $4, or $7. My books range from hard SF to tall tales to surreal fantasy. If I reach my goal I'll post the cover of my next book!