Time for another stupid question...
Why is one shape more stable than another shape?
Er....Struggled a bit with this.
Issac Newton discovered this stuff called gravity.
You throw something up in the air and if its heavier than air it comes back.
Time for two more experiments.
Try to balance a bottle on your fingertip, pointy end first.
Its difficult to balance it.
Now try it with a desert bowl upside down - try not to break it!
The desert bowl should balance much easier than the bottle as its sides hang down under your finger and help balance it.
If air has gravity, water has anti-gravity.
If you push something down under water that is lighter than water, it comes back up.
Luckily not fast enough to hit me as water is thicker than air.
Trying to push the bottle under water with your finger on the lid is nearly as difficult as doing it up the other way in air.
The bowl sits on the water and takes being pushed down in the middle without wobbling like the bottle does.