One of the first demonstrations of the ability for telecommunications to help sign language users communicate with each other occurred when AT&T's videophone (trademarked as the "Picturephone") was introduced to the public at the 1964 New York World's Fair –two deaf users were able to communicate freely with each other between the fair and another city. Various universities and other organizations, including British Telecom's Martlesham facility, have also conducted extensive research on signing via videotelephony. The use of sign language via videotelephony was hampered for many years due to the difficulty of its use over slow analogue copper phone lines, coupled with the high cost of better quality ISDN (data) phone lines. Those factors largely disappeared with the introduction of more efficient video codecs and the advent of lower cost high-speed ISDN data and IP (Internet) services in the 1990s.
Where was AT&T's "Picturephone" device unveiled?
1964 New York World's Fair

Since re-establishing independence, Estonia has styled itself as the gateway between East and West and aggressively pursued economic reform and integration with the West. Estonia's market reforms put it among the economic leaders in the former COMECON area.[citation needed] In 1994, based on the economic theories of Milton Friedman, Estonia became one of the first countries to adopt a flat tax, with a uniform rate of 26% regardless of personal income. In January 2005, the personal income tax rate was reduced to 24%. Another reduction to 23% followed in January 2006. The income tax rate was decreased to 21% by January 2008. The Government of Estonia finalised the design of Estonian euro coins in late 2004, and adopted the euro as the country's currency on 1 January 2011, later than planned due to continued high inflation. A Land Value Tax is levied which is used to fund local municipalities. It is a state level tax, however 100% of the revenue is used to fund Local Councils. The rate is set by the Local Council within the limits of 0.1–2.5%. It is one of the most important sources of funding for municipalities. The Land Value Tax is levied on the value of the land only with improvements and buildings not considered. Very few exemptions are considered on the land value tax and even public institutions are subject to the tax. The tax has contributed to a high rate (~90%) of owner-occupied residences within Estonia, compared to a rate of 67.4% in the United States.
What year did Estonia establish a flat tax?
1994

In developing countries, with high poverty and poor schooling opportunities, child labour is still prevalent. In 2010, sub-saharan Africa had the highest incidence rates of child labour, with several African nations witnessing over 50 percent of children aged 5–14 working. Worldwide agriculture is the largest employer of child labour. Vast majority of child labour is found in rural settings and informal urban economy; children are predominantly employed by their parents, rather than factories. Poverty and lack of schools are considered as the primary cause of child labour.
Who are children predominantly employed by?
their parents