Close-up of a slice of prickly pear (cactus fruit) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a supermarket. College Station, Texas, September 3, 2024

This image features two close-up photographs of a slice of prickly pear fruit, captured under different lighting conditions.

**Image 1: Daylight Illumination**

The top photograph depicts a slice of prickly pear fruit illuminated by regular daylight. The slice exhibits a greenish-yellow hue with darker brown spots scattered across its surface. A thin layer of clear gelatinous material coats the bottom edge of the slice, giving it a translucent appearance.

**Image 2: Ultraviolet (UV-A) Illumination**

The lower photograph shows the same slice when illuminated by a 365 nm UV-A blacklight from a supermarket. Under this specific light wavelength, the fruit's surface undergoes a dramatic transformation. The greenish-yellow coloration fades, and the darker brown spots become more pronounced. A striking iridescent effect emerges on the fruit's surface, characterized by hues of blue, purple, pink, and red.

**Comparison and Analysis**

Upon comparing the two images, it becomes apparent that the UV-A illumination accentuates the natural colors present in the prickly pear fruit but does not introduce any extraneous or artificial pigments. The iridescent effect observed under UV-A light likely results from the interaction between the fruit's natural oils and the specific wavelength of light. This phenomenon is a common occurrence with certain fruits, such as bananas and apples, which exhibit similar color changes when exposed to UV-A illumination.

**Conclusion**

In conclusion, this image showcases the unique properties of prickly pear fruit when illuminated by different light sources. The use of UV-A light reveals an iridescent effect that adds a new dimension to the fruit's appearance, highlighting its natural beauty and potential applications in various fields such as food science, botany, or even art. – AI vision

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En primer lugar, agradecemos a nuestro patrocinador oficial, Coca-Cola, por su apoyo en este evento. También les damos la bienvenida a todos los atletas y entrenadores que han venido aquí hoy para participar en el Campeonato Nacional de Atletismo Juvenil. Como saben, el objetivo principal de esta competencia es proporcionar una plataforma para que los jóvenes atletas demuestren su talento y potencial, y al mismo tiempo ayudarlos a mejorar sus habilidades en este deporte. Este año, hemos invitado a varios entrenadores de élite y expertos en atletismo juvenil para que brinden orientación a los jóvenes atletas y compartan sus conocimientos con ellos.
En segundo lugar, quisiera agradecer a nuestros voluntarios por su invaluable apoyo en este evento. Sin ustedes, no sería posible organizar una competencia de este nivel. Su dedicación y esfuerzo han sido cruciales para el éxito de esta competencia.
Por último, quisiera desear a todos los atletas buena suerte en esta competencia. ¡Que disfruten la experiencia y recuerden que lo más importante es participar!. – Spanish translation