The U.S postal system first began operations in 1775 and its 250th anniversary comes as Trump pursues a far-reaching shake-up ...

Self-adhesive stamps were today on sale to the general public for the first time. In future all first and second-class stamp booklets will contain self-adhesive rather than the old-fashioned ...

The self-adhesive stamp was launched by celebrity slimmer Vanessa Feltz at London's Trafalgar Square Post Office, more than 160 years after the first 'lickable' stamp, the Penny Black, went on sale.

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Conductive hydrogels are promising candidates for next-generation wearable electronics due to their flexibility, biocompatibility, and ion-conductive properties. However, achieving a balance among ...