Explanation

The printing press with movable type was invented by Johannes Gutenberg

When: Around 1440-1450.

Where: Mainz, Germany.

Explanation

(x+y) + (x-y) = 112

2x = 112

x = 56

Explanation

Lighthouse of Alexandria was one of the Seven Wonders of the Ancient World.

It was built in the 3rd century BC in Egypt.

Additional information:

The lighthouse was located on the island of Pharos, Egypt.

Great Wall of China is part of the New Seven Wonders (2007).

Explanation

Wilhelm Conrad Roentgen received the first Nobel Prize in Physics (1901).

He discovered X-rays, which revolutionized medical diagnosis.

X-rays are widely used in hospitals to detect bone fractures.

The Nobel Prizes were established by Alfred Nobel.

Explanation

Jallianwala Bagh Massacre took place on 13 April 1919

In Jallianwala Bagh massacre killing at least 379 people and injuring over 1,200 other people.

Jallianwala Bagh is a historic garden close to the Golden Temple complex in Amritsar, Punjab, India

By General Reginald Dyer order did the massacre take place in Jallianwala Bagh

 It is managed by the Jallianwala Bagh National Memorial Trust and was renovated between 2019 and 2021****

nd9-2-2023

Explanation

The Jallianwala Bagh massacre, also known as the Amritsar massacre

Jallianwala Bagh Massacre took place on 13 April 1919

In Jallianwala Bagh massacre killing at least 379 people and injured over 1,200 other people.

Jallianwala Bagh is in Amritsar  Punjab, India

By General Reginald Dyer's order did the massacre take place in Jallianwala Bagh

NOW

Jallianwala Bagh is managed by the Jallianwala Bagh National Memorial Trust and was renovated between 2019 and 2021

****

ND16-3-2023

Explanation

Aristotle was a student of Plato, studying under him at the Academy in Athens for nearly 20 years.

Aristotle joined Plato's Academy around age 17

Plato and Aristotle are famous for laying the foundations of Western philosophy

Explanation

"Conversations with Myself" is a book by Nelson Mandela that offers personal insights through letters, diaries, and recorded conversations.

Published in 2010, the book is a follow-up to his famous autobiography, Long Walk to Freedom.

Explanation

Heavy water (D₂O) is used as a moderator because it slows neutrons without absorbing them much.

A moderator slows down fast neutrons in a nuclear reactor.

Slower neutrons help sustain the fission chain reaction.

Pakistan’s nuclear reactors commonly use heavy water as a moderator.

Explanation

The enzyme responsible for breaking down starch into maltose in the human digestive system is amylase. 

Amylase is an enzyme produced in the saliva and pancreas that specifically breaks down starch into smaller sugar molecules like maltose.