The World of Growing Knowledge Chapter Notes | Be an Explorer 5: Book Solutions, Notes & Worksheets - Class 5 PDF Download

Introduction

• Communication evolution: gestures, signs, sounds, cave paintings, smoke signals, drum beats.
• Key inventions: writing, numbers, paper, printing press.

The Story of Writing: Development of a Script

• Sumerians and Cuneiform Script
  • First to develop writing.
  • Used clay tablets with cuneiform script.
  • Possibly used for counting animals or grain.
• Egyptians and Hieroglyphs
  • Developed writing based on pictures (hieroglyphs).
  • 24 letters formed from pictures.
  • Other Indian scripts developed from Brahmi.
• Braille Script
  • Developed by Louis Braille in 1825.
  • Raised dots on thick paper for visually impaired.
  • Revolutionized reading and writing for the blind.

The Story of Numbers

• Discovery of Zero and Decimal System
  • Egyptians used 'One' for measurement.
  • Indians introduced the concept of zero.
  • Decimal system discovered using ten fingers for counting.
• Roman System and Braille Numbers
  • Romans used symbols for numbers (I, II, III).
  • Louis Braille developed Braille numbers for the blind.
  • The Invention of Paper and Printing Press
• Paper Invention
  • Egyptians invented paper from papyrus plant.
  • Chinese improved papermaking, guarded the secret for 500 years.
• Printing Press Revolution
  • Johannes Gutenberg invented the printing press in the 1450s.
  • Molds of letters used to print the Bible.
  • Changed the way books were produced.

Evolution of Printing Technology

• Traditional Printing
  • Handwritten books were slow and expensive.
  • Invention of the printing press allowed mass production.
• Modern Printing
  • Electronic printers: EP-101, Daisy Wheel.
  • HP Laser Jet initiated Desktop Printing in 1984.
  • Introduction of personal computer printing by 1990.
• 3D Printing
  • Emerging technology from 2010.
  • Reproduces physical objects.

Conclusion

• Printing technology's evolution from handcrafted books to modern electronic and 3D printing.
• Ongoing advancements in communication and knowledge growth.