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She said the authorities asked her to bring back a glass or bath sponge or something that might have his DNA on it to potentially help identify him later.

Like a bath sponge, the product is able to hold and release large quantities of the gas at lower pressure and cost.

"It's like a bath sponge but with very ordered cavities," said Prof Omar Farha, from Northwestern University in the US who led the research.

"So, it works exactly like a bath sponge except in a very smart programmed way."

I broke out, feeling as if a hand had squeezed my heart like a bath sponge.