1. A - Bain’s fax precursor
Bain patented an image-transmission precursor in 1843, 33 years before Bell’s telephone patent.
2. B - Durand’s food-preserving tin can
Durand’s tin-can preservation patent dates to 1810; Yeates’s purpose-built opener followed in 1855.
3. A - The Eiffel Tower was inaugurated
The tower was inaugurated on March 31, 1889. Nintendo’s original card shop began on September 23 that same year.
4. B - Teaching at Oxford
Teaching existed at Oxford by 1096. The Aztec Triple Alliance rose to power in 1428, more than three centuries later.
5. A - Thomas Parker’s battery-electric car
Parker built a battery-electric car as early as 1884; Benz completed his petrol-powered three-wheeler in 1885.
6. B - Titanic was launched into the water
Titanic entered the water on May 31, 1911. Oreo’s official birthday is March 6, 1912.
7. A - Baird demonstrated working television to invited observers
Baird’s demonstration was on January 26, 1926. Commercial machine-sliced bread debuted in Chillicothe on July 7, 1928.
8. B - A public handheld cellular-phone call
Motorola demonstrated a handheld cellular call in 1973; Sony introduced its first Walkman in 1979.
9. A - The original Radarange microwave oven
The large early Radarange appeared in 1947. The Play-Doh brand began in 1956.
10. B - Yellowstone became a national park
Yellowstone was established on March 1, 1872. The riveted work-pants patent followed in 1873.
11. A - London’s first Underground line opened
The Metropolitan Railway opened on January 10, 1863. Lincoln died on April 15, 1865.
12. B - Sundback developed the modern zipper
Sundback had created the modern zipper by December 1913. Morgan’s traffic-signal patent followed in 1923.