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3. Green Lenses for Aviators

Top Store: Ray-Bans; Local Optometrist (if prescription glasses are needed) Product Price on Average: $100–200 per pair* Sunglasses, more stylish than aviators, are hard to come by. People have had an obsession with aviators ever since they were originally worn by military pilots in the 1930s. The green lenses are the only part of the look that hasn't changed much since it was first popularized among civilians during World War II.

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Green Aviator Glasses on Pinterest: @magpie851 Because dark green lenses were originally designed to protect pilots' eyes, aviators use them. The blue light was eliminated by the green tint. If not, pilots flying at high altitudes would have severe visual issues due to blue light. A military pilot unquestionably needs contrast and sharpness, which green glasses enhance while reducing glare.

4. Doorknobs made of brass

The best places to buy are local welders, Lowe's, and Home Depot. Prices range from $10 to $12 on average per door knob. If your home is an older, nineteenth-century home, you may have discovered when you moved in that the doorknobs were brass. The selection of brass was made for a number of reasons unrelated to the metal's inherent beauty.

Brass Doorknobs © Shutterstock/Nuttakit Doorknobs were traditionally made by brazing two pieces of metal together. Doorknob manufacturers began using casting in the 1840s. Manufacturers employing these techniques in the nineteenth century found brass to be appealing since it was strong and could withstand corrosion much more easily than other metals. Subsequent investigations would reveal that brass and copper alloys, among others, also offer increased resistance to the growth of bacteria.