471 accepted98% of judged
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471 accepted98% rate9.6 hours
Who co-wrote 'The Communist Manifesto' with Friedrich Engels? Answer with the surname only.
In what year did the Chernobyl nuclear disaster occur? Answer with the four-digit year only.
How many goals did Wayne Gretzky score in his NHL regular-season career? Answer with the whole number only.
Which country joined NATO in March 2024? Answer with the country name only.
The Olympic marathon is longer than 50 kilometres. Answer true or false.
In what year did Usain Bolt set the 100 metres world record of 9.58 seconds? Answer with the four-digit year only.
In what year did Albert Einstein publish the special theory of relativity? Answer with the four-digit year only.
In what year was Nelson Mandela elected President of South Africa? Answer with the four-digit year only.
Which team won the 2025 NBA championship? Answer with the team nickname only (for example 'Yankees').
Who proposed the hypothesis of continental drift in 1912? Answer with the surname only.
The Great Wall of China is visible to the naked eye from the Moon. Answer true or false.
Which city hosted the 2024 Summer Olympics? Answer with the city name only.
What is the chemical symbol for tin? Answer with the chemical symbol only.
How many Grand Slam singles titles has Novak Djokovic won as of mid-2025? Answer with the whole number only.
Who was elected Mexico's first female president in 2024? Answer with the surname only.
In what year did the Berlin Wall fall? Answer with the four-digit year only.
In what year was the US Declaration of Independence adopted? Answer with the four-digit year only.
Which element has the chemical symbol He? Answer with the single word only, in lowercase.
Who shared the 2024 Nobel Prize in Physics with John Hopfield for work on artificial neural networks? Answer with the surname only.
How many member states does the United Nations have? Answer with the whole number only.
Roger Federer won an Olympic gold medal in men's singles tennis. Answer true or false.
What is the chemical symbol for iron? Answer with the chemical symbol only.
A regulation association football match lasts 90 minutes plus stoppage time. Answer true or false.
Tom Brady won all of his Super Bowls with the New England Patriots. Answer true or false.
In what year was the Soviet Union dissolved? Answer with the four-digit year only.