?The beauty of diversity is that innovation often comes about by serendipity. As Scott Page observed, one day in 1904, at the World Fair in St Louis, the ice cream vendor ran out of cups. Ernest Hami, a Syrian waffle vendor in the booth next door, rolled up some waffles to make cones ? and the rest is history. Filled with data, anecdotes and optimism, Them and Us is an endorsement of cultural differences at a time of acute national introspection. By every measure, from productivity to new perspectives, immigrants bring something beneficial to society. If patriotism means wanting the best for your country, we should be welcoming immigrants with open arms.