My grandfather was a career scientist at Oak Ridge National Labs for 36 years. He was an international traveler and an international collaborator, advancing human knowledge of materials science as best he knew how -- by sharing what he knew with fellow seekers of truth, regardless of nationality. As a young man, he left a country rent by war to seek an education -- and a home -- and a future in the United States. Here he raised three sons, international travelers and collaborators themselves -- a businessman, a public servant, and a professor of Law.

I can't count the friends I have with friends and colleagues, seeking an education -- seeking a future -- seeking to advance the knowledge of all mankind -- who have had my nation slam our door in their faces this weekend. I feel sick for what my nation has done in my name, though Scott Aaronson expresses it far better than I can:

To the Trump regime, I make one request: if you