Weekly Photo Challenge: Sticky Gecko Toes


Weekly Photo Challenge is Texture

Last night two geckos were outside clinging to my kitchen window mating. This may be the best gecko porn I have ever photographed! I wondered how they pulled off their gravity-defying feat.

A little research led to the discovery that geckos can stick to surfaces because their bulbous toes are covered in hundreds of microscopic hairs called setae. Each setae branches into even smaller hairs called spatulae.

When the tiny hairs contact a wall, ceiling, or glass surface the van der Waals force kicks in. This physical bond happens when electrons in the molecules of the tiny gecko toe hairs interact with the molecules in the surface, like the glass. They create an electronic attraction. Who knew?

The balance of the forces and the angle of the hairs allow them to scurry across surfaces quickly. So, they really don’t have a sticky substance in their toes, it is all due to the physical forces of nature. Isn’t Physics amazing?

Weekly Photo Challenge: Textures of Tzintzuntzan


The Weekly Photo Challenge is Texture.

Tzintzuntzan was the capital of the Purépecha Empire when the Spanish arrived in 1522. Situated on Lake Pátzcuaro, Mexico the character of the indigenous people is clear in every archeological remnant and rock of this fascinating archeological site.

The main attraction is the five yácatas or semi-circular pyramids that are well organized and face out over the lake area.
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