Two statues have debuted on Minnesota's new Interstate 35W Bridge that are shaped to look like the international cartographic symbol for water. Why? Besides mimicking the look of the Mississippi River as it passes through Minneapolis, the new sculptures are made from a type of concrete that is photocatalytic, meaning they will be able to convert gases like carbon monoxide, nitrous oxides and sulfur dioxide to higher oxidized states, making them less damaging to the environment. Another benefit o
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