At around 2 p.m., a big white blimp was floating overhead. The blimp had no markings and was kind of a ghostly white as it floated past various SF landmarks and out over the Bay. So, what was it?

In this day and age, we have a lot of things to worry about, and oddly, random things falling out of the sky is one of them. This time, though, we’re not talking about bits of satellites or ...