Find mystery person 2!

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Across
  1. 2. What animal has the largest brain relative to body size?
  2. 4. What is the only flag that does not have four sides?
  3. 6. Which is the only body part that is fully grown from birth?
  4. 7. What is the fourth letter of the Greek alphabet
  5. 8. How many chambers does the human heart have?
Down
  1. 1. One of your favourite animals!
  2. 3. What company was initially known as "Blue Ribbon Sports"?
  3. 5. Which human bone is the longest and strongest?