_CEyRrYzPVk sergei-ponomarenko-the-ufo-time-traveler-who-disappeared-without-a-trace The UFO Time Traveler who Disappeared Without a Trace On April 23rd 2006, a man in his early 20s was seen in Kyiv, Ukraine staring at a high-rise apartment building. Witnesses described him as looking confused and anxious. They thought he might have been a lost tourist. X0V4CDsjyR8 beeyond-ideas-what-if-oxygen-disappeared-on-earth Beeyond Ideas | What if Oxygen Disappeared on Earth? Sunburns, darker sky, and combustion engine failure, are the top three answers you'll find on the internet. But are they really the worst that could happen? Watch the full video to get your mind blown! VGl_bdmhcNo we-finally-know-why-the-aztecs-disappeared We Finally Know Why the Aztecs Disappeared Around 500 years ago the once flourishing Aztec Empire suddenly collapsed. Who or what killed them? Was it the Spaniards? Or perhaps some terrible epidemic? MB9TvB7ermE 48-hours-the-year-we-disappeared-2013 48 Hours | The Year We Disappeared (2013) A little girl is terrorized when a killer wants her family dead. B7cUwWRgBcM the-year-that-the-sun-disappeared-536-ad The Year that The Sun Disappeared (536 AD) From late 535 AD to 536, written records from across the world suggest a huge climate catastrophe. Dubbed the year "without a summer", the sun was completely dimmed and shadows were invisible even at noon. The cause of of the "worst year to be alive in history" has been long uncertain.