Explanation

• Microsoft Windows 1.0 was released on November 20, 1985
• Developer: Microsoft Corporation
• Founded: 1975.
• Founders: Bill Gates and Paul Allen.

Last updated 07 Nov 2026 by NA

Explanation

• Paul Vierkötter — first recognizable electric flashbulb
• Year: 1925
• Country: Germany
• Purpose: To provide artificial light for photography.

Additional information:

• 1928–1929: Johannes Ostermeier develops an improved and safer flashbulb.
• 1930: Ostermeier receives a patent for his improved design.
• 1929–1930: Commercial flashbulbs, such as Vacublitz, become available.

Last updated 06 Nov 2026 by NA

Explanation

• Inventor: Tim Berners-Lee
• Collaborator: Robert Cailliau
• Year of invention: 1989 August
• Organization: CERN (European physics lab, Switzerland)
• First website: 1991 (public release)
• WWWW stands for World-Wide Web Worm.

Last updated 06 Nov 2026 by NA

Explanation

• Isaac Newton and Gottfried Wilhelm Leibniz independently developed calculus in the 17th century.
• Isaac Newton: Developed the method of fluxions.
• Gottfried Wilhelm Leibniz: Developed much of the notation used in calculus today.

Last updated by NA on 06-11-2026

Explanation

• Walter Hunt patented the safety pin on April 10, 1849.
• He sold the patent rights for $400, which is approximately $14,000 today.

Last updated by NA on 06-11-2026