How Long Is One Second, Really? Do we really know how long a second is? The science behind how time is actually measured may prove you wrong. Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts Could Anti-gravity Really be Possible? A Nuclear Waste Dump You Can Walk On: Weldon Spring, Missouri Cherenkov Radiation : Particles Faster Than the Speed of Light? Are Modern Humans Really Older Than We Thought? How Boeing Builds a 737 in Just Nine Days The Fastest Human-Made Object Ever