A) Nelson
B) Karl von Drais
C) Louis Braille
D) John Hall
Inventions
Who invented the Polio vaccine?
A) Jonas Salk
B) Burk Holder
C) Robert Koch
D) Albert Sabin
A) Nelson
B) Karl von Drais
C) Louis Braille
D) John Hall
A) Jonas Salk
B) Burk Holder
C) Robert Koch
D) Albert Sabin
