The Twenty-First Century has seen some extraordinary progress in the aero-sciences. The idea of ‘Think Air’, for instance, has progressed from far-fetched theoretical possibility to commonly-accepted phenomenon, even if it remains badly understood. And with that expansion of the theoretical domain we’ve seen parallel growth in the practical art of Think Air Management. Even, now though, the massive Blend Farms, springing up around the country remain controversial. Can air of different weights really be blended as is claimed? Does this reliably assuage temperate gusting? Does Holbrook’s Constant still hold, even in a post-blend aerocell? We cannot yet know, but, still these are some impressive machines.