Problem: The Reinvent the Toilet Challenge is a long-term research and development effort to develop a hygienic, stand-alone toilet. This challenge is being complemented by another investment program to develop new technologies for improved pit latrine emptying (called by the foundation the "Omni-Ingestor") and fecal sludge processing (called "Omni-Processor"). The aim of the "Omni Processor" is to convert excreta (for example fecal sludge) into beneficial products such as energy and soil nutrients with the potential to develop local business and revenue.
What is reinvent the toilet trying to develop
The answer is the following: The Reinvent the Toilet Challenge is a long-term research and development effort to develop a hygienic, stand-alone toilet

Problem: On December 21, 1968, Frank Borman, James Lovell, and William Anders became the first humans to ride the Saturn V rocket into space on Apollo 8. They also became the first to leave low-Earth orbit and go to another celestial body, and entered lunar orbit on December 24. They made ten orbits in twenty hours, and transmitted one of the most watched TV broadcasts in history, with their Christmas Eve program from lunar orbit, that concluded with a reading from the biblical Book of Genesis. Two and a half hours after the broadcast, they fired their engine to perform the first trans-Earth injection to leave lunar orbit and return to the Earth. Apollo 8 safely landed in the Pacific ocean on December 27, in NASA's first dawn splashdown and recovery.
Which three people were the first to ride the Saturn V rocket into space?
The answer is the following: Frank Borman, James Lovell, and William Anders

Problem: The U.S., UK, France, Italy and the majority of other Western countries considered the annexation of Estonia by the USSR illegal. They retained diplomatic relations with the representatives of the independent Republic of Estonia, never de jure recognised the existence of the Estonian SSR, and never recognised Estonia as a legal constituent part of the Soviet Union. Estonia's return to independence became possible as the Soviet Union faced internal regime challenges, loosening its hold on the outer empire. As the 1980s progressed, a movement for Estonian autonomy started. In the initial period of 19871989, this was partially for more economic independence, but as the Soviet Union weakened and it became increasingly obvious that nothing short of full independence would do, Estonia began a course towards self-determination.
What relationship did Western countries continue with Estonia?
The answer is the following: diplomatic relations

Problem: The life cycles of insects vary but most hatch from eggs. Insect growth is constrained by the inelastic exoskeleton and development involves a series of molts. The immature stages can differ from the adults in structure, habit and habitat, and can include a passive pupal stage in those groups that undergo 4-stage metamorphosis (see holometabolism). Insects that undergo 3-stage metamorphosis lack a pupal stage and adults develop through a series of nymphal stages. The higher level relationship of the Hexapoda is unclear. Fossilized insects of enormous size have been found from the Paleozoic Era, including giant dragonflies with wingspans of 55 to 70 cm (2228 in). The most diverse insect groups appear to have coevolved with flowering plants.
What stage of development differentiates a 4-stage metamorphosis from a 3-stage metamorphosis, notably absent in the latter?
The answer is the following:
pupal stage