Explanation

• IQ stands for "Intelligence Quotient"
• It was coined by the German psychologist William Stern in 1912.

Additional information:

• Alfred Binet (1905): the first practical test to measure intelligence and introduce the idea of "mental age".
• William Stern (1912): Proposed the IQ formula: Mental Age ÷ Chronological Age × 100

Last updated 08 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

• Archimedes is widely recognized as the "Father of Mathematics"
• He was an Ancient Greek mathematician, physicist, engineer, and astronomer,
• He was an inventor from the ancient city of Syracuse in Sicily
• Born: c. 287 BC, Syracuse, Sicily
• Died: c. 212 BC (aged approximately 75), Syracuse, Sicily

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

Explanation

Albert Einstein 

- Profession: Theoretical physicist.

- Century: One of the most influential physicists of the 20th century.

- 1905: Published four landmark scientific papers.

- Nobel Prize: Awarded for his explanation of the photoelectric effect, not the Special Theory of Relativity.