Porn Core Thumbnails
scishow: Why Is Indigo in the Rainbow?Indigo may be a very vague and unnecessary color, but it has an interesting history that involves some plants, turmoil, and Isaac Newton’s interest in the number seven.
scishow: Why Is Indigo in the Rainbow?Indigo may be a very vague and unnecessary color, but it has an interesting history that involves some plants, turmoil, and Isaac Newton’s interest in the number seven.