The RMS Titanic sank in the early morning hours of 15 April 1912 in the North Atlantic Ocean, four days into the ship's maiden voyage from Southampton to New York City. The largest ocean liner in service at the time, Titanic had an estimated 2,224 people on board when she struck an iceberg at around 23:40 (ship's time)[a] on Sunday, 14 April 1912. Her sinking two hours and forty minutes later at 02:20 (ship's time; 05:18 GMT) on Monday, 15 April, resulted in the deaths of more than 1,500 people, making it one of the deadliest peacetime marine disasters in history.
HMHS Britannic (/brɪˈtænɪk/) was the third vessel of the White Star Line's Olympic class of steamships and the second White Star ship to bear the name Britannic. She was the fleet mate of both the RMS Olympic and the RMS Titanic and was intended to enter service as a transatlantic passenger liner.
Britannic was launched just before the start of the First World War. She was designed to be the safest of the three ships with design changes actioned during construction due to lessons learned from the sinking of the Titanic. She was laid up at her builders, Harland and Wolff, in Belfast for many months before being put to use as a hospital ship in 1915. In 1915 and 1916 she served between the United Kingdom and the Dardanelles. On the morning of 21 November 1916 she was shaken by an explosion caused by a naval mine of the Imperial German Navy near the Greek island of Kea and sank 55 minutes later, killing 30 people.
The Enigma machine is an encryption device developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military.
Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma's keyboard and another person writes down which of 26 lights above the keyboard lights up at each key press. If plain text is entered, the lit-up letters are the encoded ciphertext. Entering ciphertext transforms it back into readable plaintext. The rotor mechanism changes the electrical connections between the keys and the lights with each keypress. The security of the system depends on Enigma machine settings that were changed daily, based on secret key lists distributed in advance, and on other settings that change for each message. The receiving station has to know and use the exact settings employed by the transmitting station to successfully decrypt a message.
World War II (often abbreviated as WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from more than 30 countries. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 70 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, genocides (including the Holocaust), strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war.
ENIAC (/ˈɛniæk/; Electronic Numerical Integrator and Computer) was the first electronic general-purpose digital computer. It was Turing-complete, and able to solve "a large class of numerical problems" through reprogramming.
Although ENIAC was designed and primarily used to calculate artillery firing tables for the United States Army's Ballistic Research Laboratory (which later became a part of the Army Research Laboratory), its first program was a study of the feasibility of the thermonuclear weapon.
ENIAC was completed in 1945 and first put to work for practical purposes on December 10, 1945.
The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. It was the first microprocessor, and the first in a long line of Intel CPUs. The chip design, implemented with the MOS silicon gate technology, started in April 1970, and was created by Federico Faggin who led the project from beginning to completion in 1971. Marcian Hoff formulated and led the architectural proposal in 1969, and Masatoshi Shima contributed to the architecture and later to the logic design. The first delivery of a fully operational 4004 occurred in March 1971 to Busicom Corp. of Japan for its 141-PF printing calculator engineering prototype (now displayed in the Computer History Museum – Mountain View, Ca) . This calculator for which the 4004 was originally designed and built as a custom chip  was first commercially available in July 1971.
The IBM Personal Computer, commonly known as the IBM PC, is the original version of the IBM PC compatible hardware platform. It is IBM model number 5150 and was introduced on August 12, 1981. It was created by a team of engineers and designers under the direction of Don Estridge in Boca Raton, Florida.
The generic term "personal computer" ("PC") was in use years before 1981, applied as early as 1972 to the Xerox PARC's Alto, but the term "PC" came to mean more specifically a desktop microcomputer compatible with IBM's Personal Computer branded products. The machine was based on open architecture, and third-party suppliers sprang up to provide peripheral devices, expansion cards, and software. IBM had a substantial influence on the personal computer market in standardizing a platform for personal computers, and "IBM compatible" became an important criterion for sales growth. Only the Apple Macintosh family kept a significant share of the microcomputer market after the 1980s without compatibility to the IBM personal computer.