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The Gecko Problem

The Gecko Problem. Title your lab:. Do you know Geckos?. Common lizard in tropics Insect hunters Excellent climbers Frequent human structures. On your paper record the question: 1) What makes geckos good climbers?. 2) Propose at least 2-3 working hypotheses.

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The Gecko Problem

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  1. The Gecko Problem Title your lab:

  2. Do you know Geckos? • Common lizard in tropics • Insect hunters • Excellent climbers • Frequent human structures

  3. On your paper record the question: 1)What makes geckos good climbers? 2) Propose at least 2-3 working hypotheses. 3) How could you test this? Be specific. State the criteria you would observe that would make you accept or reject your hypotheses

  4. Want more data? Look at the feet, make some observations.

  5. They can even hang upside down

  6. And on glass…

  7. On glass upside down… 4) Does this new information or visual data change your hypotheses? How? Do you accept or reject your current hypothesis given the current data.

  8. The gecko’s toes are an inspiration to bio-engineering.

  9. How do Gecko’s toes REALLY work????? Remember the electron cloud? • Contains Electrons (-) • Orbit around the nucleus • Constant motion! Like bumble bees on a leash? Or bees around a hive, they’re always moving!

  10. Geckos: Van der Waals Forces at work • Exists between molecules: • 1. e- moving can cause unequal distribution of charge • Basically, wherever the electrons are, that region of the atomor molecule is more negative. • The result……. • 2. Really weakly + & - regions of molecules. Exist for fractions of seconds!

  11. So surface area is key! More folds, more surface, more molecules, more van der Waals!!!!! 2. gecko feet

  12. 5) Summarize the way Geckos cling to surfaces. What are the bonds called? Are they strong or weak bonds? How can these bonds suspend the gecko?Hand in your gecko problems

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