Are you trying to fit more into already overfull days? Maybe you really believe that once you've finally mastered your life to perfection, you'll be able to relax and enjoy life. But life's demands are never done once and...
We can’t “see” ultraviolet light, because our eyes don’t have the receptors needed to detect it. Small birds see it (they have a fourth light receptor dedicated to just that). Bees also see ultraviolet light to find flowers that...