"National Geographic - Germ Launch Article": HTML5 Crossword

Across

1. Six ___ four equals 24. (5)
3. spit (6)
6. New England ___ of Medicine (7)
8. MIT fluid dynamics scientist (9)
11. viruses and bacteria (5)
12. sneezy speed limit (one ___ mph) (7)
16. ____ work together. (10)
18. Cover it! (5)
19. larger ones fall faster (8)

Down

2. push or shove out (5)
4. in flight (8)
5. The D in CDC (7)
7. slimy goo (5)
9. related to breathing (11)
10. facial filter (4)
12. The H in WHO (6)
13. Wash hands ____. (10)
14. set into flight (6)
15. fabric (5)
17. evidence of illness (8)