Title: Race and ethnicity in the United States Census.
Question: In what year did a federal judge say that three immigrants from Mexico were not eligible to be citizens because of their race?

Title: Incandescent light bulb.
Question: What positive effects does a slower-evaporating filament enable?

Title: Unicode.
Question: Who created Graphite?

Title: Karl Popper.
Question:
Which of Hayek's publications was dedicated to Popper?