[Ans] Which U.S. city installed the world's first electric traffic light?

Step 1 : Introduction to the question "Which U.S. city installed the world's first electric traffic light?"

The world’s first electric traffic signal was put into place on the corner of Euclid Avenue and East 105th Street in Cleveland, Ohio, on this day in 1914. The device used red and green lights with a buzzer that warned when the color was about to change. The invention was designed by James Hoge, who received a U.S. patent in 1918. His "municipal traffic control system" displayed electrically-powered STOP and MOVE signs mounted on posts at each corner of an intersection that were wired to a manually-operated switch housed inside a control booth nearby.

[Answer] Which U.S. city installed the world's first electric traffic light?

Step 1 : Introduction to the question "Which U.S. city installed the world's first electric traffic light?"

...The world’s first electric traffic signal was put into place on the corner of Euclid Avenue and East 105th Street in Cleveland, Ohio, on this day in 1914. The device used red and green lights with a buzzer that warned when the color was about to change. The invention was designed by James Hoge, who received a U.S. patent in 1918. His "municipal traffic control system" displayed electrically-powered STOP and MOVE signs mounted on posts at each corner of an intersection that were wired to a manually-operated switch housed inside a control booth nearby.

[Ans] Who originally came up with the idea of electric Christmas tree lights?

Step 1 : Introduction to the question "Who originally came up with the idea of electric Christmas tree lights?"

The tree was traditionally decorated with "roses made of colored paper, apples, wafers, tinsel, [and] sweetmeats" the apples and and round ornaments are supposed to represent the fruit of knowledge of good and evil from the first book in the Bible, Genisis . In the 18th century, it began to be illuminated by candles which were ultimately replaced by Christmas lights after the advent of electrification. Today, there is a wide variety of traditional ornaments, such as garlands, baubles, tinsel, and candy canes. An angel or star might be placed at the top of the tree to represent the archangel Gabriel or the Star of Bethlehem from the Nativity. Edible items such as gingerbread, chocolate and other sweets are also popular, and are tied to or hung from the tree's branches with ribbons.

Step 2 : Answer to the question "Who originally came up with the idea of electric Christmas tree lights?"

Thomas Edison's assistant:

Before the advent of strands of electric Christmas lights, families would illuminate their Christmas trees with candles. This practice fostered many a home fire. In 1882, Edward H. Johnson, Thomas Edison's longtime assistant and friend, put together the first string of electric lights for stringing around a Christmas tree. Though Edison had fashioned a string of lights together in 1880 for display strand around the outside of his Menlo Park laboratory, Johnson's version was specifically for the Christmas tree, and the rest is history. 

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At what intersection was the world's first electric traffic signal installed in 1914?

Step 1 : Introduction to the question "At what intersection was the world's first electric traffic signal installed in 1914? "

The world's first, manually operated gas-lit traffic signal was short lived. Installed in London in December 1868, it exploded less than a month later, injuring or killing its policeman operator