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The secret to the concrete's warming is low-temperature liquid paraffin, which is a phase-change material, meaning it releases heat when it turns from its room-temperature state -- as a liquid -- to a solid, when temperatures drop.

In a previous paper, the group reported that incorporating liquid paraffin into the concrete triggers heating when temperatures drop.

The aggregate absorb the liquid paraffin before being mixed into the concrete.

“It’s very personal to us, but it’s important to the whole country. After all, we don’t live in dangerous buildings any more, but thousands of people go to sleep at night in homes effectively covered with liquid paraffin,” says Daffarn.

Removing the eggs from the nest and dipping them in liquid paraffin forms a seal around the egg that stops them from maturing and hatching.