...But he's not around right now.
Dr Hornschnabel returned recently from a research mission in Baja California. He reports that, on the Tropic of Cancer at high noon on the day of the solstice, shadows disappear. He is still trying to figure out where they go, and hoping someone will fund similar research work on the Tropic of Capricorn next December, perhaps a little fishing village along the Chilean coast? Takers, anyone? I mean, this is serious science being conducted here!