Glass SphereScience brain teasers require understanding of the physical or biological world and the laws that govern it.
You are in a glass sphere suspended by a steel chain from the Empire State Building. With you in the sphere are a sugar cube and a small stone, and you are holding a pigeon. You will gain your freedom if you can make the sphere lighter using the pigeon. What is your best strategy for escape? (Note: the pigeon must remain inside the sphere at all times.)
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