As Japan endures another summer of oppressive heat waves, innovative technology and extreme cooling solutions are taking centre stage. On July 23, CNN's correspondent Hanako Montgomery shared a hands-on look at a new gadget tested in Tokyo: a human-sized, glass-doored portable refrigerator designed to give people a brief respite from sweltering outdoor temperatures. In the Instagram video, stepping inside the freestanding metallic cabin, she took a seat on a built-in bench as the glass door shut behind her. "Oh, it is chilly," she remarked as the unit rapidly dropped the surrounding temperature, adding, “This isn't a fridge for food. It's...