Ricardo's Easter Brain Exerciser

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Across
  1. 4. What is the longest river in South America?
  2. 5. Who was Burnley FC’s longest serving manager
  3. 7. Which city hosted the 2016 Summer Olympics?
  4. 9. What is the name of the largest known structure in the universe, consisting of a vast network of galaxies?
  5. 11. Which ancient civilization developed the concept of zero as a numerical placeholder?
  6. 14. Who proposed the concept of the "Big Bang" as the origin of the universe?
  7. 17. Who was the first president of the United States?
  8. 19. What is the title of the novel by Leo Tolstoy about Russian aristocracy during the Napoleonic era?
  9. 24. What is the term for the theoretical framework that seeks to unify the fundamental forces of nature?
  10. 27. What is the term for the condition where a person believes they are dead or do not exist?
  11. 28. What is the capital city of New Zealand?
  12. 29. In which country is the ancient city of Petra located?
  13. 30. What is the highest mountain peak in North America?
Down
  1. 1. Who wrote the novel "One Hundred Years of Solitude"?
  2. 2. Who was the first female prime minister of a European country?
  3. 3. Who is the author of the mathematical work "Principia Mathematica," which laid the foundations for classical mechanics?
  4. 6. What is the name of the hypothesis that suggests the existence of an advanced extraterrestrial civilization capable of harnessing the energy of entire galaxies?
  5. 8. What is the term for the process by which an organism develops from a single fertilized egg cell?
  6. 10. What is the term for the point in a black hole where gravitational forces are so strong that nothing, not even light, can escape?
  7. 12. Who was the first woman to win a Nobel Prize?
  8. 13. What is the name of the particle associated with the Higgs field, responsible for giving other particles mass?
  9. 15. Who holds the record for the most goals scored in FIFA World Cup history?
  10. 16. What animal has been observed to lift weights of 1,800kg (4,000 pounds) with relative ease. 4 to 9 times the strength of an average human male.
  11. 18. Which ancient civilization developed the first known system of writing, known as cuneiform?
  12. 20. Who formulated the principle of uncertainty in quantum mechanics?
  13. 21. Where was Vladimir Putin born on 7 October 1952
  14. 22. What is the name of the river that flows through the Grand Canyon?
  15. 23. Who was the ancient Greek philosopher known for his paradoxes, such as the paradox of Achilles and the Tortoise?
  16. 25. What is the term for a group of islands?
  17. 26. Which Shakespearean play features the character Iago?