![A milkman makes deliveries using his horse-drawn wagon circa 1935.](https://npr.brightspotcdn.com/dims4/default/ecfdc7d/2147483647/strip/true/crop/458x344+0+0/resize/880x661!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fassets%2Fnews%2F2010%2F03%2F05%2Fmilkman-520d3b0bcc63ee1b53f7716bec300205b5bb0733.jpg)
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![After 1900, when so-called artificial ice became generally accepted as safe, mass quantities were produced at ice plants and delivered to homes. A worker delivers a block of ice in 1936.](https://npr.brightspotcdn.com/dims4/default/cc75266/2147483647/strip/true/crop/455x341+0+0/resize/880x660!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fassets%2Fnews%2F2010%2F03%2F05%2Ficeman-b1b116693b4cc64f9c0f8a87796c8a22212b2eb1.jpg)
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![After 1900, when so-called artificial ice became generally accepted as safe, mass quantities were produced at ice plants and delivered to homes. A worker delivers a block of ice in 1936.](https://npr.brightspotcdn.com/dims4/default/cc75266/2147483647/strip/true/crop/455x341+0+0/resize/880x660!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fassets%2Fnews%2F2010%2F03%2F05%2Ficeman-b1b116693b4cc64f9c0f8a87796c8a22212b2eb1.jpg)
Fox Photos / Getty Images
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