GRE Vocabulary Lesson: Unveiling the Power of Touchstones - Discerning the Genuine from the Fake

Explore the fascinating concept of a touchstone - a small, dark stone with the power to distinguish the genuine from the fake, the valuable from the worthless. Discover how this term has evolved from its literal meaning to a metaphorical standard for judging quality and authenticity across various fields, from literature and art to science and law.