Problem: On 1 January 1967, Yugoslavia was the first communist country to open its borders to all foreign visitors and abolish visa requirements. In the same year Tito became active in promoting a peaceful resolution of the ArabIsraeli conflict. His plan called for Arabs to recognize the state of Israel in exchange for territories Israel gained.
In what year did the first communist country open its borders to all foreign visitors?
The answer is the following: 1967

Problem: There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water. There are approximately 51030 bacteria on Earth, forming a biomass which exceeds that of all plants and animals. Bacteria are vital in recycling nutrients, with many of the stages in nutrient cycles dependent on these organisms, such as the fixation of nitrogen from the atmosphere and putrefaction. In the biological communities surrounding hydrothermal vents and cold seeps, bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. On 17 March 2013, researchers reported data that suggested bacterial life forms thrive in the Mariana Trench, which with a depth of up to 11 kilometres is the deepest part of the Earth's oceans. Other researchers reported related studies that microbes thrive inside rocks up to 580 metres below the sea floor under 2.6 kilometres of ocean off the coast of the northwestern United States. According to one of the researchers, "You can find microbes everywhere they're extremely adaptable to conditions, and survive wherever they are."
How does bacteria help to sustain life in hydrothermal vents and cold seeps?
The answer is the following: by converting dissolved compounds

Problem: The Hanover Zoo is one of the most spectacular and best zoos in Europe. The zoo received the Park Scout Award for the fourth year running in 2009/10, placing it among the best zoos in Germany. The zoo consists of several theme areas: Sambesi, Meyers Farm, Gorilla-Mountain, Jungle-Palace, and Mullewapp. Some smaller areas are Australia, the wooded area for wolves, and the so-called swimming area with many seabirds. There is also a tropical house, a jungle house, and a show arena. The new Canadian-themed area, Yukon Bay, opened in 2010. In 2010 the Hanover Zoo had over 1.6 million visitors.
What award did the Hanover Zoo receive four years in a row?
The answer is the following: Park Scout Award

Problem: The United States Army maintains the Ronald Reagan Ballistic Missile Defense Test Site on Kwajalein Atoll. Marshallese land owners receive rent for the base.
What is the official name of the missile test facility?
The answer is the following:
Ronald Reagan Ballistic Missile Defense Test Site