20 years of whut?

I don't remember anything about what happened 20 years ago. This whole Berlin Wall deal everybody's talking about, I remember hearing about it in my first year of college, but it doesn't resonate with me like the news tells me it's supposed to. It was this thing that went on in a place.

What else happened 20 years ago that I forgot?

• The Exxon Valdez ran aground in Alaska
• Tiananmen Square massacre
• Soviet forces pull out of Afghanistan (glad that Afghanistan issue is solved!)
  
• 6.9 earthquake hits San Fransisco

I remember all that stuff, but none of it clearly. It's like I stored it all on a 5 1/4" floppy.