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When general relativity was first put forward in 1915, the math was very unfamiliar to most physicists. Now we teach general relativity to advanced high school students.

"Sunday Q&A: Physicist seeks truth about cosmos". Interview With Eric Berger, www.chron.com. September 27, 2009.
When general relativity was first put forward in 1915, the math was very unfamiliar to most physicists. Now we teach general relativity to advanced high school students.