Which rare earth element saw its price drop by over 90% in the early 2010s, revolutionizing pricing in green technology and scientific instrumentation?

In the world of scientific research and industry, access to rare elements and materials has always been a crucial factor in innovation. Over time, pricing strategies for these vital scientific resources have evolved dramatically due to technological advancements, geopolitical factors, and supply chain developments. Test your knowledge about a significant pricing shift that transformed scientific research accessibility!

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Neodymium - enabling affordable MRI machines and wind turbines
Gadolinium - making quantum computing components more accessible
Ytterbium - reducing the cost of high-precision atomic clocks
Europium - democratizing advanced display technologies