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Title : About those gecko feet.
link : About those gecko feet.

About those gecko feet.

I mean, look at them:

THERE IS A GECKO SITTING ON THE TOUCHSCREEN OF THE PHONE, MAKING CALLS WITH HIS TINY GECKO FEET!!! This gecko has called me 15 times, and everyone in our recent call list. *Actual photo of telemarketer* @TMMC @GEICO @HawaiianTel pic.twitter.com/USyKeOiDbE

— Dr. Claire Simeone (@Claire_Simeone) October 5, 2018

I got there via "A gecko, seriously, made dozens of mysterious phone calls from a Hawaii marine mammal hospital" (WaPo). And I found the closeup of the gecko foot on the Wikipedia article "Gecko feet" (there's an article just for the feet!).

The interactions between the gecko's feet and the climbing surface are stronger than simple surface area effects. On its feet, the gecko has many microscopic hairs, or setae... that increase the Van der Waals forces between its feet and the surface.

The Van der Waals forces!

The following equation can be used to quantitatively characterize the Van der Waals forces, by approximating the interaction as being between two flat surfaces:



where F is the force of interaction, AH is the Hamaker constant, and D is the distance between the two surfaces. Gecko setae are much more complicated than a flat surface, for each foot has roughly 14,000 setae that each have about 1,000 spatulae. These surface interactions help to smooth out the surface roughness of the wall, which helps improve the gecko to wall surface interaction.

And the gecko to touchscreen surface interaction!

Thus Article About those gecko feet.

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