- Third in the series, Manhood, shows a now grown figure in the vessel, amid the tribulations of adult life. Storm clouds ominously darken the sky, wind whips at the man’s clothing and rain falls in the background as the boat approaches a treacherous part of the river which has become rocky and rapid, running through a treacherous gorge marked by a gnarled, leafless tree. Gentler country lies at the bottom of the defile and the distant sky line lightens in that direction hinting of the hope of better times ahead. Among the dangers the man has not lost his faith: he has let go of his boat’s tiller (which may have broken) and is part kneeling, gazing upward with hands clasped together. The vessel’s figurehead now holds the hourglass while far above, behind and unseen by the voyager, his guardian angel continues to watch over from the Heavens, shining brightly through a break in the clouds.
- Wave–particle duality (Wikipedia)
Wave–particle duality is the concept in quantum mechanics that quantum entities exhibit particle or wave properties according to the experimental circumstances. It expresses the inability of the classical concepts such as particle or wave to fully describe the behavior of quantum objects. During the 19th and early 20th centuries, light was found to behave as a wave, and then later discovered to have a particulate character, whereas electrons were found to act as particles, and then later discovered to have wavelike aspects. The concept of duality arose to name these contradictions.