Before transistors, there were vacuum tubes. Now researchers are taking a look backward. “ We’re revisiting vacuum tubes from the 1940s, ” says physicist Griff L.
दस साल पहले न्यू यॉर्क स्टेट यूनिवर्सिटी ने यह खोज करने की ठानी कि ऐसा क्यों है ।