What will we learn next?
Take a look at some bar codes that Google Maps has turned up.
What are these all about?
We are told that they were camera calibrating devices. American spy planes in the 1950s and 1960s flew overhead, taking photos. But to take a good photo, a camera needs precise measurements for focusing. These bar codes provided the masters.
Anyway, that’s the official line.
In half a century, none of this leaked out. It makes you wonder. How many things have never leaked out? How many don’t leak out today, and won’t for 50 years?