Context and question: In 1972, the French physicist Francis Perrin discovered fifteen ancient and no longer active natural nuclear fission reactors in three separate ore deposits at the Oklo mine in Gabon, West Africa, collectively known as the Oklo Fossil Reactors. The ore deposit is 1.7 billion years old; then, uranium-235 constituted about 3% of the total uranium on Earth. This is high enough to permit a sustained nuclear fission chain reaction to occur, provided other supporting conditions exist. The capacity of the surrounding sediment to contain the nuclear waste products has been cited by the U.S. federal government as supporting evidence for the feasibility to store spent nuclear fuel at the Yucca Mountain nuclear waste repository.
In what county was the Oklo mine located?
Answer: Gabon
Context and question: In several countries, like Germany, the Netherlands, Switzerland and Turkey, institutes of technology and polytechnics are institutions of higher education, and have been accredited to award academic degrees and doctorates. Famous examples are the Istanbul Technical University, ETH Zurich, İYTE, Delft University of Technology and RWTH Aachen, all considered universities.[citation needed]
What kind of institutions do countries like Germany and Switzerland consider institutes of technology to be?
Answer: institutions of higher education
Context and question: There are seven suburbicarian sees: Ostia, Albano, Porto and Santa Rufina, Palestrina, Sabina and Mentana, Frascati and Velletri. Velletri was united with Ostia from 1150 until 1914, when Pope Pius X separated them again, but decreed that whatever cardinal bishop became Dean of the College of Cardinals would keep the suburbicarian see he already held, adding to it that of Ostia, with the result that there continued to be only six cardinal bishops.
How did Pope Pius X maintain only four cardinal bishops?
Answer:
unanswerable