20th Century Inventions

In what year were traffic lights invented?

• 1981

• 1905

• 1923

• 1938

____ ____ led a team at Texas Instruments that invented the first portable Calculator

Which of the following was invented first

• Traffic Lights

• Portable Calculator

• Microwave Oven

• Pop-up Toaster

Who invited the Microwave Oven?

• Percy Spencer

• Nancy Smith

• John Adams

• Paul Cornu

Automotive Inventions were more important than Household inventions during the 19th century

• YES

• NO