12 reactions | Historian and UFO researcher Richard Dolan reviews reports of unidentified flying objects from the 1700s and 1800s—long before modern aircraft or drones existed.These sightings challenge the idea that UFOs are an advanced military technology: | Extraterrestrials And Contactees | Facebook

1.1M views · 10K reactions | Two generations of drones. Learn more about the technical extremes of the evolution of racing. | DHL | Facebook