Explanation

• The term Geography was first used by the Greek scholar Eratosthenes.
• He lived in the 3rd century BC (around 276–194 BC).
• He is also known as the “Father of Geography”.
• He calculated the circumference of the Earth with remarkable accuracy.
• His work laid the foundation of modern geographical studies.

Last verified on 02-05-2026

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

• The famous book "Al-Qanun" (The Canon of Medicine) was written by Abu Ali Sina.
• It is also known as Avicenna. 
• The book covers medicine, diseases, and treatments.

Last verified on 27-04-2026

Explanation

• Al-Biruni was a famous Muslim mathematician, astronomer, and geographer.
• He calculated the Earth's radius using trigonometric principles and measurements of the angle of dip from a mountain.
• His estimated radius was approximately 6,339.6 km, which was remarkably close to the modern mean radius of about 6,371 km.
• He lived from 973 CE to 1048 CE.

Last verified on 09-11-2026

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