Title: Compact disc.
Question: What did the CD evolve from?

Title: IPod.
Question: On how many sides of the Lightning connector are the pins located?

Title: Daylight saving time.
Question: In what year did the NBS revisit the DOT's 1975 study and find traffic fatalities unaffected?

Title: Mandolin.
Question:
These mandolin are used in a popular dance music called?