Explanation

• Lewis Waterman invented the first practical fountain pen in 1884.
• He was an American inventor who improved the ink-feeding system.
• His design regulated ink flow and reduced leakage.
• The fountain pen stores ink in a reservoir and delivers it to the nib.

Last verified on 29-10-2026

Explanation

• First successful personal computer: Altair 8800
• Developed by: MITS
• Introduced in: 1975
• IBM PC launched: 1981

Last updated on 26 Oct 2026

Explanation

• A Barometer is an instrument used to measure air (atmospheric) pressure.
• It helps in weather forecasting by measuring changes in atmospheric pressure.
• The mercury barometer is the oldest type of barometer.
• It was invented by Evangelista Torricelli in 1643.
• Barometers are widely used in meteorology and aviation.

Last verified on 09-07-2026

Explanation

• Sergen Brin & Larry Page is the founder of Google.
• Sergey Brin is the real owner of Google.
• Google, a US multinational technology company.
• It is a type of search engine operating since 1997.
• It was founded in the year: September 4, 1998
• The Headquarters of Google is located in the city of California.
• Parent organization: Alphabet Inc.

Last verified on 31-03-2026

Explanation

• Name: NCSA Mosaic
• Released: 1993
• Developed by: National Center for Supercomputing Applications (NCSA)
• Famous for: Making the World Wide Web popular through its graphical interface.