- Papua New Guinea (Wikipedia)
Papua New Guinea, officially the Independent State of Papua New Guinea, is a country in Oceania that comprises the eastern half of the island of New Guinea and its offshore islands in Melanesia (a region of the southwestern Pacific Ocean north of Australia). It shares its only land border with Indonesia to the west and its other close neighbours are Australia to the south and the Solomon Islands to the east. Its capital, located on its southern coast, is Port Moresby. The country is the world’s third largest island country, with an area of 462,840 km2 (178,700 sq mi).
- Riemann hypothesis (Wikipedia)
In mathematics, the Riemann hypothesis is the conjecture that the Riemann zeta function has its zeros only at the negative even integers and complex numbers with real part 1/2. Many consider it to be the most important unsolved problem in pure mathematics. It is of great interest in number theory because it implies results about the distribution of prime numbers. It was proposed by Bernhard Riemann (1859), after whom it is named.