and delivery service sector. This was only further perpetuated by the rise in cryptocurrency throughout the decade, such as Bitcoin. By May 2018, over 1,800 cryptocurrency specifications existed. In the same vein as cryptocurrency, the trend towards a cashless society continued as non-cash transactions and digital currency saw an increase in favourability in the 2010s. By 2016, only about 2 percent of the value transacted in Sweden was by cash, and only about 20 percent of retail transactions were in cash. Fewer than half of bank branches in the country conducted cash transactions. A report published during the final year of the decade suggested that the percentage of payments conducted in cash in the United Kingdom had fallen to 34% from 63% ten years earlier. The 2016 United States User Consumer Survey Study claimed that 75 percent of respondents preferred a credit or debit card as their payment method while only 11 percent of respondents preferred cash. Science and technology Two of the most prominent deaths in the scientific community during the decade were Neil Armstrong in 2012 and Stephen Hawking in 2018. Below are the most significant scientific developments of each year, based on the annual Breakthrough of the Year award of the American Association for the Advancement of Science journal Science. 2010: The first quantum machine 2011: HIV treatment as prevention (HPTN 052) 2012: Discovery of the Higgs boson 2013: Cancer immunotherapy 2014: Rosetta comet mission 2015: CRISPR genome-editing method 2016: The Laser Interferometer Gravitational-Wave Observatory makes the first observation of gravitational waves, fulfilling Einstein's prediction 2017: Cosmic convergence: Neutron star merger (GW170817) 2018: Development cell by cell 2019: First black hole image released Technology Robotics, particularly drones like quadcopters, experienced a wide use and application in the 2010s. Autonomous and electric car technology and sales showed considerable growth as well. In addition, sustainable space launch technologies were spearheaded by entrepreneurs like Elon Musk. Video Games began to merge hand in hand with technology as seen in applications like Wii Street U, an app which used Google Street View and the Nintendo Wii U to examine the cities of the world, streets, and addresses on a virtual globe. In 2016, the number of people globally using mobile devices to access the internet overtook those using desktop computers for the first time, having been preceded by the U.S. two years prior in 2014. 3D printers also emerged in the