The Smitten Ice Cream shop in the Hayes Valley of San Francisco serves fresh ice cream with one novel ingredient: liquid nitrogen. The shop is located inside of a repurposed shipping container.
Some extra-virgin olive oil is adulterated with lower-priced, lower-grade oils and artificial coloring along the supply chain without retailers or consumers ever knowing.
The Delboeuf illusion makes one dot appear larger than the other. But they're the same size. Your brain is misled by comparing the dots to the surrounding circles.