[Answer] Tens of thousands of people are demonstrating in this Czech city in what organizers described as "the biggest protest since the fall of Communism."

Step 1 : Introduction to the question "Tens of thousands of people are demonstrating in this Czech city in what organizers described as "the biggest protest since the fall of Communism.""

...Protesters in Prague are demanding the resignation of Prime Minister Andrej Babis, accused of fraud and collaborating with the Communist-era secret police, and his justice secretary Marie Benesova.

[Answer] 8. Ex-US president, Ronald Reagan, was a Republican who was firmly opposed to communism. His policies have been credited as being a significant factor in the demise of Soviet communism. Ronald Reagan suffered from which degenerative brain disease?

Step 1 : Introduction to the question "8. Ex-US president, Ronald Reagan, was a Republican who was firmly opposed to communism. His policies have been credited as being a significant factor in the demise of Soviet communism. Ronald Reagan suffered from which degenerative brain disease?"

...1. Parkinson's disease 2. Alzheimer's disease 3. Huntington's chorea 4. Lou Gehrig's (motor neurone) disease Ronald Reagan revealed his battle with Alzheimer's disease in November 1995 in an open letter to the American people, however, it was clear that he was suffering from some form of dementia during his years in office (1981-1989), exhibiting symptoms of poor memory, disorientation and repetitive speech.

[Answer] 4. What happened after the collapse of Communism in Czechoslovakia?

Step 1 : Introduction to the question "4. What happened after the collapse of Communism in Czechoslovakia?"

...1. Hungary claimed part of the country 2. Mikhail Gorbachev invaded Czechoslovakia to regain control 3. Nothing 4. The country split into the Czech Republic and Slovakia After this happened Czechoslovakia became what is now present day Slovakia and the Czech Republic. The separation occurred without violence (unlike in the case of Yugoslavia) and was thus said to be "velvet", much like the "Velvet revolution" which preceded it and which was accomplished through massive peaceful demonstrations and actions.