Slogan by Matthieu Romagny
http://stacks.math.columbia.edu/tag/0468#comment-913
Slogan by Matthieu Romagny
http://stacks.math.columbia.edu/tag/034F#comment-914
Slogan by Johan de Jong

Thanks to Matthieu Romagny
http://stacks.math.columbia.edu/tag/09TE#comment-915
Slogan by Johan de Jong and Matthieu Romagny
http://stacks.math.columbia.edu/tag/02JN#comment-916
Historical comment regarding prescheme
Thanks to Johan Commelin
http://stacks.math.columbia.edu/tag/01IJ#comment-917