Explanation:
Assembly line
On December 1, 1913, Henry Ford installs the first moving assembly line for the mass production of an entire automobile. His innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes
first atomic reaction
Chicago Pile-1 (CP-1) was the world's first artificial nuclear reactor. On 2 December 1942, the first human-made self-sustaining nuclear chain reaction was initiated in CP-1, during an experiment led by Enrico Fermi.
Telegraph
Samuel Morse independently developed and patented a recording electric telegraph in 1837.
light bulbs
In 1878, Thomas Edison began serious research into developing a practical incandescent lamp and on October 14, 1878, Edison filed his first patent application for "Improvement In Electric Lights".
Father of hydrogen bomb
Edward Teller (Hungarian: Teller Ede; January 15, 1908 – September 9, 2003) was a Hungarian-American theoretical physicist who is known colloquially as "the father of the hydrogen bomb"
author diplomat scientist and inventor
Benjamin Franklin, also called Ben Franklin, pseudonym Richard Saunders, (born January 17 [January 6, Old Style], 1706, Boston, Massachusetts [U.S.]—died April 17, 1790, Philadelphia, Pennsylvania, U.S.), American printer and publisher, author, inventor and scientist, and diplomat
