Researchers say we don’t put on enough sunscreen. A Seattle startup has come up with a potential fix: an invisible ink stamp that notifies you when it’s time to re-apply. Michael Croix, a longtime ...
Japan has many charms: impeccably timed trains, vending machines that can surprise any type of traveller, and… stamps. Not just any stamps — eki stamps, the proudly inked souvenirs hiding in stations ...
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