>>The surface doesn't appear to be sealed, so I imagine the aerogels are saturated with air.
>>
>>That would be analogous to wood - most woods are less dense than water and therefore float, but not if they're saturated with water i.e. waterlogged.
>
>Good reply, it is definitely a better way of explaining it, rather than having to go into the complexities of specific gravities, intertial mass, intermolecular bindings & Van Der Waals force.

I agree, Neil.
Al made that so clear that even I understood it.
That got me interested enough to read the article and it's fascinating indeed.
My son and his wife are structural engineers and I passed it along to them.