1. Dogs do not see in black and white. psychologytoday.com Dogs only see a limited spectrum of colors compared to humans, but that old "fact" you've heard about dogs seeing in only shades of grey isn't true. To a dog, the world is mostly shades of blue, yellow, and grey . 2. Sitting too close to the TV won't harm your eyes more. Christine Mariner / Getty Images While watching a lot of TV can cause eye fatigue and potentially harm your vision, sitting too close doesn't make much of a difference , if any. However, this myth was true back before the 1950s, when companies made televisions that emitted dangerous levels of radiation ...up to 100,000 times more than what federal officials deemed safe. 3. Lemmings don't run off cliffs. Tinieder / Getty Images The myth about lemmings committing suicide by running off cliffs came about from the 1950s nature documentary White Wilderness , produced by Dis...