id 182, 193, 194, 238 Hilbert Problems 196, 221 Hilbert’s 10th Problem 243, 253 Hilbert’s Hotel 182 Himalayas 55 hippocampus 11, 32 Hitler, Adolf 213 Hoane, Joe 5 Hodges, Wilfrid 150 H6f6i House 79, 80 Hofstadter, Douglas xi, 49, 310 Hogarth, Mark 280 Hole in the Wall Project 35 Holmes, Sherlock 148 holo