When Sony shipped the first Walkman in 1979, chairman Akio Morita insisted on a second headphone jack and a “hotline” talk button, convinced it would be rude for one person to listen to music alone — and within a few years buyers had ignored the sociable features so completely that Sony quietly dropped them

The Sony Walkman TPS-L2 went on sale in Japan on July 1, 1979, and the machine that reached store shelves that summer had two headphone jacks on the side instead of one, plus a small orange button marked “hotline.” Both features came directly from Sony chairman Akio Morita, who was convinced it would be rude

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Close-up of glowing jellyfish swimming gracefully in deep green ocean waters.

A species of jellyfish called Turritopsis dohrnii can revert its adult cells back to a juvenile polyp stage when injured or starving, effectively restarting its life cycle, and biologists have so far failed to identify any natural limit to how many times it can do this.

Explore the historic Roman bridge in lush Salamanca, Spain captured beautifully in daylight.

The Roman aqueduct at Segovia, built around the first century AD without mortar, still carried water into the 1970s, its 167 granite arches held together by nothing but the precise weight distribution of stones cut to fit each other within fractions of a millimeter.

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