Dating tweny first century
Generally, the early years of the 21st century were pronounced as "two-thousand (and) five", with a change taking place in 2010, where pronunciations often shift between the early-year standard of "two-thousand and ten" and the common approach used in the late 20th century of "twenty-ten".
In contemporary history, the 21st century essentially began in 1991 (the end of Short Twentieth Century) with the United States as the sole superpower in the absence of the Soviet Union, while China began its rise and the BRICS countries aimed to create more balance in the global political and economic spectrum.
Kubrick said he did this in the hope that if the film became popular, it would influence the pronunciation of that year.
By the 2010s, gene therapy, first performed somatically in late 1990 and heritably in 1996, showed promise but remains an experimental and emerging technology.
Assistive reproductive technology developed in the 1980s, such as polar body biopsy and preimplantation genetic diagnosis, has allowed for the selection of genetic traits, and, along with the advent of ultrasound, has increased the number of boys and decreased the number of girls in many countries, most notably in China and India but also in other Asian and eastern Europe countries.
This began in the late 1980s in China and India and after the fall of communism in the Balkans and Caucasus regions, concurrent with both the advent of capitalism in those countries and the widespread availability of reproductive technology.
While digital telecommunications technology became widely used by most of the world, concerns about stress from the overuse of mobile phones, the Internet, and related technologies remain controversial.