Which happened earlier: London Underground opens or Fall of Berlin Wall?

Question 1

Which happened earlier?

A London Underground opens ✓ Earlier

B Fall of Berlin Wall

London Underground opens (10 January 1863) came before Fall of Berlin Wall (9 November 1989)

Question 2

Which happened earlier?

A British Library founded

B Ireland decimalises currency ✓ Earlier

Ireland decimalises currency (15 February 1971) came before British Library founded (1 January 1973)

Question 3

Which happened earlier?

A Harry Potter and the Philosophers Stone published ✓ Earlier

B Three Gorges Dam begins operation

Harry Potter and the Philosophers Stone published (26 June 1997) came before Three Gorges Dam begins operation (10 July 2003)

Earlier #169