We all have choices. We can build walls or we can build bridges. We can give our talents to creating weapons of annihilation, as so many scientists have done, or we can work to find solutions to humanities greatest problems. Our orientation is found not only in our acts, but also in the policies we support or oppose.

Perhaps the singular positive of [Donald] Trump's desire to improve the deteriorating relations between the U.S. and Russia will lead to achieving progress toward a world free of nuclear weapons.

At one point, for example, [Donald Trump] argued that he knew much more than military leaders about the pursuit and defeat of ISIS. His assuredness of his own correctness seems also rooted in arrogance reflecting his fundamental insecurity. This insecurity and his belief in his own rightness, when combined with his success at making money, leads him to be self-reliant in his decision-making, which could result in his taking risks with threatening or using nuclear weapons.

During World War II, the Nazis put their victims into gas chambers and then incinerated them in ovens. While the Nazis took their victims to the incinerators, those who possess and threaten to use nuclear weapons plan to take these weapons - these portable incinerators - to the victims.

During the primaries, if another candidate criticized him, [Donald] Trump would respond with even stronger criticism toward his attacker.

A lot will depend on who [Donald] Trump chooses for key cabinet positions, but even more will depend on his consultations with his key advisor (himself).

That the man in question should be Donald Trump, with all his personal flaws, challenges the United States and the world as never before in human history.