Practice your trivia skills: Science & Nature
CategoriesScience & Nature
76. How many types of quarks are there in the standard model of physics?
4
2
3
6
77. How many officially recognized dwarf planets in the solar system are named after Polynesian deities?
2
0
1
5
78. Who developed the first successful polio vaccine in the 1950s?
Frederick Robbins
Jonas Salk
John F. Enders
Thomas Weller
79. Who made the discovery of X-rays?
Wilhelm Conrad Röntgen
Thomas Alva Edison
Albert Einstein
James Watt
80. Dry ice is the solid form of what substance?
Oxygen
Nitrogen
Ammonia
Carbon dioxide
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