4. The global battle for the living room continued in Germany with Sony announcing it 2has sold 10 million PlayStation 4s worldwide. To keep that momentum going, Sony announced a number of exclusive new titles at the show, including the action game Hellblade from developer Ninja Theory, the open world adventure game Wild from Rayman creator Michel Ancel, the shooter Alienation from Housemarque, and Q Games genre-bending The Tomorrow Children. Microsoft announced that Square Enix and Crystal Dynamics Rise of the Tomb Raider, the second game in the rebooted Lara Croft franchise, will be an Xbox exclusive in 2015. Xbox will also be getting another big sequel next year with Halo 5: Guardians.
6. Shapley made early theoretical inroads into the subject, using game theory to analyze different matching methods in the 1950s and 1960s. Together with US economist David Gale, he developed a mathematical formula for how 10 men and 10 women could be coupled in a way so that no one would benefit from trading partners. While that may have had little impact on marriages and divorces, the algorithm they developed has been used to better understand many different markets.