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How Four Discoveries Changed Lives is a free printable Grade 3 to Grade 5 social studies worksheet on the causes and effects of four inventions, aligned to C3 Framework indicator D2.His.14.3-5. It prints 2 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

How Four Discoveries Changed Lives

D2.His.14.3-5

NameDate

Read each information text, then answer the questions.

1.Read the information text, then answer the questions.

Jonas Salk and the Polio Vaccine

An information text written for this worksheet. Polio is a disease caused by a virus. It can make muscles weak and sometimes leaves people unable to walk or to breathe on their own. In the early 1950s, polio struck tens of thousands of Americans every year, most of them children. Many families kept their children away from swimming pools and summer camps, afraid of catching it. Jonas Salk, an American doctor and scientist, made a vaccine to protect people from polio. In 1954, more than a million children took part in a test of the vaccine. In April 1955 the vaccine was announced as safe and effective. Salk did not patent it, so it could be made widely. Within a few years, polio cases in the United States fell sharply.

  1. 1. What happened to polio cases after the vaccine?
  2. 2. How many children took part in the 1954 test?
  3. 3. What causes polio?
2.Read the information text, then answer the questions.

Louis Daguerre and the First Photographs

An information text written for this worksheet. Before 1839, the only way to keep a picture of a person or a place was to draw or paint it, which took a skilled artist many hours. Louis Daguerre, a French artist, worked for years on a way to fix an image made by light onto a metal plate. In 1839 the French government announced his method, called the daguerreotype, and soon made it free for people to use. Within a few years, photography studios opened in cities in Europe and the United States. For the first time, ordinary families could have pictures of themselves. Historians and newspaper artists could now work from real pictures of faces and places from events, not only drawings.

  1. 1. What was Daguerre's method called?
  2. 2. How did photography help people who study history?
  3. 3. What did Daguerre's method fix an image onto?

LessonPrint · D2.His.14.3-5 · Set 10 · free to copy for classroom use

Answer key — How Four Discoveries Changed Lives

Set 10. Prints on its own sheet.

  1. 1.1. Polio cases in the United States fell sharply within a few years. 2. More than a million children. 3. A virus.
  2. 2.1. The daguerreotype. 2. They can see real faces and places from events, not only drawings. 3. A metal plate.

Last reviewed 2026-09-05. Aligned to D2.His.14.3-5 of the C3 Framework for Social Studies State Standards.