News Snapshot:
If you cruise high above the US and peer down, you might catch a glimpse of giant barcode-like symbols embossed into a panel of tarmac. Rest assured, these are not QR codes for aliens to keep tabs on Earth, nor the long-lost relics of an ancient civilization. The strange symbols were used in the 20th century to calibrate the lenses of aerial and satellite cameras. Most were made in the 1950s and '60s when the Cold War was heating up and the US was bolstering its aerial reconnaissance technology. Advertisement Advertisement Up close at ground level, you can see the...
