History of Inventions and Their Impact

The video discusses three significant inventions from the 1920s: the television, the refrigerator, and the polygraph. The television, invented by John Logie Baird, revolutionized media by transmitting images over short distances. The refrigerator became a staple in American homes, despite initial resistance in Britain due to cooler climates. The polygraph, created by John Larson, aimed to detect lies through physiological measurements, though its reliability remains debated. These inventions had lasting impacts, with some still in use today.

What was the general impact of inventions from the 1920s?

• They were only popular in Europe.

• They changed the lives of millions and are still used today.

• They had no significant impact on society.

• They were mostly forgotten over time.

Who invented the television and when were the first televised pictures sent?

• Nikola Tesla in 1925

• Alexander Graham Bell in 1922

• John Logie Baird in 1924

• Thomas Edison in 1920

What was a notable feature of the first televised pictures?

• They were in color.

• They were broadcasted worldwide.

• They were high definition.

• They showed human faces with eyes opening and closing.

When did home refrigerators become popular in the USA?

• In the 1930s

• In the 1920s

• In the 1910s

• In the 1940s

Why were British people initially less interested in refrigerators?

• They were not advertised in Britain.

• They were too expensive.

• They thought they were unnecessary due to cooler weather.

• They preferred traditional methods.

What was the main reason for the increase in refrigerator sales in Britain?

• A decrease in the price of electricity.

• A sudden change in climate.

• Heavy advertising and detailed descriptions of their advantages.

• Government subsidies.

Who invented the polygraph and in what year?

• Thomas Edison in 1920

• John Larson in 1921

• Alexander Graham Bell in 1922

• John Logie Baird in 1924

What does the polygraph measure to determine if someone is lying?

• Voice pitch

• Heart rate, breathing, and blood pressure

• Eye movement

• Brain waves

Why were polygraph results not accepted as evidence in court?

• They were too complicated to understand.

• They were too expensive to use.

• They were not available at the time.

• They were not considered reliable.

Despite their controversial nature, why are polygraphs still used by some police forces?

• They are required by law.

• They are cheaper than other methods.

• They are 100% accurate.

• Many people believe they work, so they tell the truth.