Did the Berlin Wall prevent any athletes from competing in the 1936 Summer Olympics?
Rationale first then the answer.
The 1936 Olympics were held in 1936. The Berlin Wall was not constructed until 1961.. The answer is: no.

Can actress Danica McKellar skip astronaut education requirements?
Rationale first then the answer.
Astronaut's are required to have a bachelor's degree in engineering, biological science, physical science, computer science, or mathematics. Actress Danica McKellar graduated summa cum laude from UCLA with a degree in Mathematics.. The answer is: yes.

Is Mixed martial arts totally original from Roman Colosseum games?
Rationale first then the answer.
Mixed Martial arts in the UFC takes place in an enclosed structure called The Octagon. The Roman Colosseum games were fought in enclosed arenas where combatants would fight until the last man was standing. Mixed martial arts contests are stopped when one of the combatants is incapacitated. The Roman Colosseum was performed in front of crowds that numbered in the tens of thousands. Over 56,000 people attended UFC 193.. The answer is: no.