Context: In 1972, the French physicist Francis Perrin discovered fifteen ancient and no longer active natural nuclear fission reactors in three separate ore deposits at the Oklo mine in Gabon, West Africa, collectively known as the Oklo Fossil Reactors.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.

Question: Of what nationality was Perrin?
Answer: French

Question: In what county was the Oklo mine located?
Answer: Gabon

Question: How old are the ore deposits in the Oklo mine?
Answer: 1.7 billion years

Question: When the Oklo mine ore deposits came into being, what percentage of uranium on Earth consisted of uranium-235?
Answer: 3%

Question: Where in the United States is there a nuclear waste repository?
Answer: Yucca Mountain

Question: Of what nationality wasn't Perrin?
Answer: Unanswerable

Question: In what country was the Oklo mine not located
Answer: Unanswerable

Question: How old are the ore deposits in the Oslo mine?
Answer: Unanswerable

Question: When the Oklo mine ore deposits came into being, what percentage of uranium on Earth consisted of uranium-253?
Answer: Unanswerable

Question: Where in the United States is there no nuclear waste repository?
Answer: Unanswerable