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+# Biological Scales
+
+## Cells in the World
+
+### Powers of Ten
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/0fKBhvDjuy0?si=nhwGXbDLXKGn66oi" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
+### Cell Size and Scale
+
+[![Cell Size and Scale](images/cells-scale.png)](https://learn.genetics.utah.edu/content/cells/scale/)
+
+### How BIG are the CELLS?
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/uIGOOcrT86A?si=tVXePBFj4eHU9mkx" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
+### Our Viral World
+
+[![Our Viral World](images/how-virus-look.png)](https://www.nationalgeographic.com/magazine/2021/02/see-how-viruses-look-up-close-feature/)
+
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