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Powered by a battery, with Wi-Fi data transfer and waterproofing, the sensor can work outdoors for over a month, allowing for extended data collection.

It could have been used as a perfume, medicine, or for waterproofing, he explains.

It was only this year when the owner of the building ordered some waterproofing work that the 16-year mystery could be solved.

Water was ponding against his house foundation, and he was considering signing a contract with a waterproofing company for the above amount.

However, researchers have found it challenging to achieve waterproofing without the use of extra layers that end up decreasing the flexibility of the film.