Instead, their two BASIS schools, one in Tucson and this one in suburban Phoenix, explicitly compete with the best schools in the world-south Korea's in maths, say, or Finland's in classics.

Tucson resident Sheila Martin was able to capture video of the mysterious lights, and she described seeing at least four lights moving from south to northeast in a boomerang formation.

The capital and largest city of Arizona, in the south-central part of the state northwest of Tucson. Settled c. 1868, it became territorial capital in 1889 and state capital in 1912.