I bought a few pairs of eclipse glasses over the years. One was clearly defective (it let through way too much light).

That made me wonder: would a defective pair still block UV light?

I assumed the answer was probably no, but I decided to try a simple experiment.

Ingredients:
1) Good eclipse glasses
2) Suspect/Defective eclipse glasses
3) UV-sensitive color changing beads

Method:
1) I used three small plastic cups and filled them each with color-changing UV sensitive beads.
2) I wrapped the outside with metal tape to block light from the outside.
4) I covered two of them with solar eclipse glasses.
5) I exposed them to direct sunlight for several minutes.

Results:
Surprisingly, the UV beads didn't show any color change through either pair of glasses.

This suggests that my defective pair was still blocking the UV that these beads respond to, even though it failed the visible light test.

The experiment (and my bizarrely edited video) is captured here:
https://youtu.be/NearkopsWh4

Strawberries aren't actually berries. Botanically, they're aggregate accessory fruits, and under the microscope, their unusual anatomy becomes even more apparent. 🍓🔬

Our friend Chloé Savard, known as tardibabe on Instagram, reveals a hidden world of tightly packed plant cells, delicate vascular tissue, and pigment-filled compartments. The bright reds come from anthocyanins, water-soluble pigments stored inside the cells that help protect the fruit from UV damage while also attracting animals to disperse its seeds.

The geometric network you see is made of cell walls built primarily from cellulose, giving the fruit its structure while remaining flexible enough to hold the water and sugars that make strawberries so juicy. Tiny sparkling circles scattered throughout the sample are air bubbles trapped during slide preparation, while the shimmering rainbow colors appear where polarized light interacts with microscopic structures inside the fruit.

Look closely at the green leafy cap and you'll find long, hair-like trichomes. These tiny outgrowths help defend the developing fruit from insects, reduce water loss, and shield delicate tissues from environmental stress.

Next time you bite into a strawberry, remember: you're crunching through a microscopic city of living plant cells, pigments, and tiny biological structures that most of us never get to see.

Sources:

• Plant Physiology and Development (Taiz, Zeiger, Møller & Murphy, Oxford University Press)
• Biology 2e (OpenStax), Chapters 30–33: Plant Form, Function, and Reproduction
• Molecular Bases of Strawberry Fruit Quality Traits: Advances, Challenges, and Opportunities, Plant Physiology (2023)
• Recent Advances in Biosynthesis and Regulation of Strawberry Anthocyanins, Horticulture Research (2025)
• The Strawberry: Composition, Nutritional Quality, and Impact on Human Health, Nutrition (Giampieri et al., 2012)