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The single most important piece of evidence from the case was a thumbnail-sized fragment of circuit board, found embedded in the neck band of a shirt from the suitcase that held the bomb.

A fragment of circuit board found in the wreckage was identified as part of a Swiss-made bomb timer which had been sold to Libya.

As well as lithium-ion batteries, vapes also contain circuit boards which - if not disposed of properly - can leach toxic compounds such as cobalt and copper into the environment as they degrade.

Most researchers in the green electronics field are searching for alternatives to the rare and expensive materials used in electronic circuitry, so Santato applauds Nair and the team for targeting the underlying circuit board instead.

At the Royal Mint plant, piles of circuit boards are being fed into the new facility.