And we keep coming back to it...

No, those aren't fish eggs in sand nor a wasp nest with larva.
It's concrete. It's concrete with an additive. It's concrete with additive beads that make it lighter and durable.
Elemix is a polymeric sphere that can be added to concrete to make the mixtures lighter, more consistent, and resists cracking. The thermal performance increases and it's even easier to pump. The sustainability aspects of it are a little bit of a stretch but every bit helps, I suppose.
It can be used in topping slabs, equipment pads, concrete block, and other applications. And even though it's claiming all kinds of scientific development, I 'm pretty sure the Aha! moment came when the clumsy mover stepped in the newly poured concrete walkway at the brand new house, causing his boot to get stuck and him to fall while carrying the kid's pretty princess bean bag chair. Little styrofoam balls went flying everywhere, completely coating the wet concrete! Ruined sidewalk? No, no. Scientific discovery!
(And I promise I will stay away from concrete for a while.)