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

Explanation

• Alexander Graham Bell is credited as the inventor of the telephone.
• He was awarded the first successful patent for it.
• The telephone was invented in 1876.
• Bell made the first-ever telephone call to his assistant Thomas Watson.

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.

Explanation

Cape of Good Hope 

• - Explorer: Bartolomeu Dias (Portuguese).
• - Year: 1488.
• - First European: To round the southern tip of Africa.
• - Original Name: Cape of Storms (Cabo das Tormentas).
• - Renamed By: King John II of Portugal.
• - New Name: Cape of Good Hope (Cabo de Boa Esperança).
• - Location: Cape Peninsula, Western Cape, South Africa.

Last updated by NA on 05-11-2026