Taj Mahal
|
 |
2.9 |
|
|
Toilets
|
|
2.9 |
|
|
Machu Picchu
|
|
2.9 |
|
|
X-Rays
|
|
2.9 |
|
|
Refrigerators
|
|
2.9 |
|
|
Solar Panels
|
|
2.9 |
|
|
TVs and Remote Controls
|
|
2.9 |
|
|
Colosseum
|
|
2.8 |
|
|
Great Wall of China
|
|
2.7 |
|
|
Petra
|
|
2.7 |
|
|
Big Ben
|
|
2.7 |
|
|
Watching the Sky in Nature
|
|
2.9 |
|
|
Germ Theory
|
|
2.9 |
|
|
Vaccines
|
|
2.9 |
|
|
Smart Homes
|
|
2.9 |
|
|
Antibiotics
|
|
2.9 |
|
|
Eiffel Tower
|
|
2.8 |
|
|
Parthenon
|
|
2.9 |
|
|
Light Bulbs
|
|
2.9 |
|
|
Denmark
|
 |
2.9 |
|
|
Iceland
|
|
2.9 |
|
|
Costa Rica
|
|
2.8 |
|
|
Cambodia
|
|
2.8 |
|
|
Chile
|
|
2.7 |
|
|
