What do all these things have in common?

12345678910111213141516
Across
  1. 4. Inventor of Asphalt
  2. 7. Gridlike breakfast item
  3. 10. Favorite Super Bowl beverage
  4. 11. Europes first skyscraper
  5. 12. Cousin of the clam
  6. 14. Second in Command star
  7. 15. BMI creator
  8. 16. Perfect compliment of any burger
Down
  1. 1. Switzerland is famous for this sweet
  2. 2. Cancer cell discoverer
  3. 3. Women's clothing designer
  4. 4. Gem of pressured earth
  5. 5. Inventor of the Saxophone
  6. 6. Founding father of the modern human anatomy
  7. 8. Author of European reform confessional written in 1561
  8. 9. Worlds tallest man
  9. 13. Star of My Fair Lady