#63 Mysterious Booms

Strange sounds coming from the earth ? The sky ? Last Christmas Day at approximately 1 am the whole house shook and it felt like a tree had landed on the roof. No structural damage. Reports of similar booms were heard in various parts of North America late last year and now into 2014. All kinds of theories but no facts other than what people are experiencing. Some booms are being accompanied by flashes of light and or horn like sounds, since 2011.