This time of year, bushels of rhubarb, potatoes, and lettuce can be harvested in abundance at the People’s Pantry, a community garden that doubles as a fresh food pantry in Blackpool, England.

ANSWER: The words are often used interchangeably. While the two materials are related, in reality, they are quite different.

Self-consolidating concrete: Self-consolidating concrete is a form of concrete that sets and hardens quickly, without cement mixers. It can be poured under water, and once it’s dry, it will ...

We know that concrete derives its strength from a mixture we call calcium aluminate silicate hydrates, or CASH. But we don’t know how Romans combined it all to get that mixture.

But it is much less resilient than the concrete used in Roman times; over the course of decades, it develops cracks that, by letting water in, can eventually destroy the material.