The product is a 2015 Cook Islands. 999 silver coin featuring the Space Time Continuum design, graded as PR 70 by NGC. This uncirculated coin has received two awards and is certified by NGC with certification number 4434331-001. Made in the Cook Islands, this unique coin is a valuable addition to any coin collection, showcasing high craftsmanship and a distinctive theme. The Space-Time Continuum coin has won two 1st place awards: – 1st place – Coin Constellation 2016 «Original Technology». 1st place – Krause Coin of the Year Award 2017 «Most Innovative Coin». The term space-time was created by the mathematician Hermann Minkowski who, in 1908, mathematically proved that space and time cannot be separated from one another. Interestingly, he was the teacher of a certain Albert Einstein at the Polytechnic Institute in Zürich. When in 1905, Minkowski heard about the development of the special theory of relativity by his former student, he apparently said: “I would not really have expected that from Einstein”. However, it was Einstein who set the biggest milestone in the research of space-time curvature so far in 1915, with his general theory of relativity. Mintage: 1,500 pcs.