Explanation

• Nicolaus Copernicus proposed the heliocentric model.
• Heliocentric means the Sun is at the center.
• Earth and other planets revolve around the Sun.
• Proposed in the 16th century.
• Ptolemy supported the geocentric model (Earth-centered).

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

• Heinrich Wilhelm Waldeyer coined the word "neuron" in 1891.
• He based it on the ancient Greek word for sinew or cord.
  
• Neuron theory/doctrine emerged at the end of the 19th century.
• Core claim — Nerve tissue = individual cells; each is a genetic, anatomic, functional, and trophic unit.
  
  Last updated by NA on 09-09-2026

Explanation

• Jabir ibn Hayyan, known as the "father of chemistry."
• He was an Arab Chemist.
• Composition of Alchemy was written by Jabir Bin Hayyan.

Notable ideas:

• Use of organic substances in chemistry
• Sulfur-mercury theory of metals
• Science of the balance
• Science of artificial generation

Last verified on 07-02-2026

Explanation

• Sir Isaac Newton formulated the Three Laws of Motion.
• He presented them in 1687 in his famous work Principia Mathematica.

Three Laws of Motion:

1. First Law — Law of Inertia: An object remains at rest or in uniform motion unless acted upon by an external force.
2. Second Law — Law of Acceleration: The net force on an object is related to its mass and acceleration.
3. Third Law — Action and Reaction: For every action, there is an equal and opposite reaction.

Last verified on 05-09-2026

Explanation

• Penicillin, the first true antibiotic, was discovered by Alexander Fleming.
• He made this discovery in 1928 at St. Mary’s Hospital, London.
• He found that a mould (Penicillium) killed bacteria in culture dishes.
• His findings were officially published in 1929.
• First patient treated: Albert Alexander (12 February 1941)

Last verified on 01-06-2026

Explanation

• Antonie van Leeuwenhoek is known as the Father of Microbiology.
• He was the first to observe and describe microorganisms using a microscope.
• He observed microscopic organisms in 1674.
• His discoveries included bacteria, protozoa, and other microscopic life forms.

Last verified on 05-09-2026

Explanation

• Discoverer: Alexander Fleming
• Year of discovery: 1928
• Place: St. Mary's Hospital, London
• First patient treated with penicillin: Albert Alexander
• Date of first treatment: 12 February 1941

Last verified on 01-07-2026

Explanation

• Marconi invented Radio.
• Radio was invented in 1895.
• Guglielmo Marconi was an Italian inventor.

Last verified on 12-08-2026

Explanation

• Inventor: Thomas Alva Edison.
• Country: United States.
• Practical incandescent bulb: 1879.
• Other contributions: Electric power, sound recording, motion pictures.
• Famous invention: Phonograph.

Last verified on 03-09-2026