Explanation

• First man who travelled in Space was Yuri Gagarin in 1961.
• Yuri Gagarin was a Soviet pilot and cosmonaut.
• He aboard the first successful crewed spaceflight, became the first human to journey into outer space.

Additional information:

• First man who Walk in Space was Alexei Leonov in 1965.
• First man who Walk on Moon was Neil Armstrong in 1969.

Last verified on 10-03-2026

Explanation

The Nobel Prize for the discovery of the electron was awarded to J. J. Thomson in 1906.

He received the Nobel Prize in Physics for his investigations into the conduction of electricity in gases, which led to the discovery of the electron in 1897.

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Explanation

Antonie van Leeuwenhoek first observed yeast cells using his single-lens microscope in 1680. 

Explanation

Carolus Linnaeus  was a Swedish botanist,

He is widely recognized as the "Father of Taxonomy".

In the 18th century, he published his seminal work, Systema Naturae, in which he introduced a formal, hierarchical system for classifying and naming living organisms.

Explanation

Johann Dobereiner, a German chemist, introduced the concept of 'triads' in 1817

 Law of Triads, Groups of three elements with similar properties; middle element's atomic mass is average of others.

Explanation

Jean-Jacques Rousseau is called the Father of the French Revolution.

Born on June 28, 1712

Died on July 2, 1778, at the age of 66 years.

Explanation

Jean-Jacques Rousseau was born on June 28, 1712

Died on July 2, 1778, at the age of 66 years.

He is called the Father of the French Revolution.

Explanation

Oxygen was discovered in 1774 by English chemist Joseph Priestley,

He isolated it by heating mercuric oxide and called it "dephlogisticated air".

Oxygen was discovered independently by Carl Wilhelm Scheele (around 1772)

Explanation

HIV (Human Immunodeficiency Virus) was first identified in 20 May 1983

By researchers Luc Montagnier and Françoise Barré-Sinoussi in France.

Their discovery linked HIV to AIDS, leading to significant advancements in understanding and managing the disease.

Explanation

Wilhelm Johannsen coined the term “gene” in 1909

Johannsen created "gene" from the Greek word genos, meaning "birth" or "race".

He  was a Danish botanist and geneticist

 He is best known for coining the terms gene, phenotype, and genotype, and for his 1903 "pure line" experiments in genetics.

Born: 3 February 1857, Elsinore, Denmark

Died: 11 November 1927 (aged 70) Copenhagen, Denmark