Why does egg float upwards in stirred bottle of water?

[MulderFBI]

Hello, why does the egg float upwards in a stirred bottle of water? I have tried making same experiment with other objects in different shapes but only the egg shape seems to float upwards. Here's the link to the video:

Second experiment:


Thank you for help.

 

[Chestermiller]

Have you tried the 2nd experiment with solid materials having close to the same weight and shape as the egg? Have you tried the 2nd experiment with shaking the same way as the first experiment (rather than with a stirrer)?

 

[rumborak]

For the second video I think it might also have something to do with the fact that the vessel bulges out in the middle. The centrifugal force will naturally make it go to the widest part of the vessel.