Whizz-kids

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Across
  1. 1. famous scientist with an IQ of 160
  2. 4. synonym of essential
  3. 6. having a strong desire to succeed
  4. 8. someone with great mental ability
Down
  1. 2. exceptional skill or ability
  2. 3. opposite of kind
  3. 5. child with extraordinary abilities
  4. 7. numerical measure of intelligence