- The New Dungeness Light Station, built in 1857 is the second oldest lighthouse in Washington state. It marks the end of Dungeness Spit, the longest natural sand spit in the world, extending approximately six miles northeast from the mainland into the Strait of Juan de Fuca. From the sea, this low-lying sandy shoal is barely visible, making it an extreme hazard to shipping. Even with a beacon and fog signal, numerous vessels have run aground there. Located in Clallam County, the New Dungeness Lighthouse continues to be an important aid to navigation in the Strait of Juan de Fuca.
- Double-slit experiment (Wikipedia)
In modern physics, the double-slit experiment demonstrates that light and matter can satisfy the seemingly incongruous classical definitions for both waves and particles. This ambiguity is considered evidence for the fundamentally probabilistic nature of quantum mechanics. This type of experiment was first performed by Thomas Young in 1801, as a demonstration of the wave behavior of visible light. In 1927, Davisson and Germer and, independently George Paget Thomson and his research student Alexander Reid demonstrated that electrons show the same behavior, which was later extended to atoms and molecules. Thomas Young’s experiment with light was part of classical physics long before the development of quantum mechanics and the concept of wave–particle duality. He believed it demonstrated that Christiaan Huygens’ wave theory of light was correct, and his experiment is sometimes referred to as Young’s experiment or Young’s slits.