Fascinating! Your guesses are excellent. As always, I enjoy be able to see your thinking processes: looks green, doesn’t have pupils, looks like a statue, etc. I fear that today’s clue might be a giveaway.
Tomorrow is the big reveal: I’ll post the full picture and information about the person, along with links to resources in Discovery Education for you to learn more about him or her.
(PS: over the weekend, you will find a post from my colleague, Kyle, about his behind-the-scenes experience at Google, along with information about the archive to that event.)
Here is the last image clue. Does it confirm or deny your guess?