Explanation

3D printing builds objects layer by layer, which is the core idea of additive manufacturing.

Material is added progressively to create the desired shape, unlike subtractive techniques that remove material.

This technology allows complex geometries and customized designs.

Explanation

Christiaan Huygens (1629–1695) proposed the wave theory of light.

He suggested that light travels in the form of waves, not particles.

Huygens’ principle explains how light waves propagate, reflect, and refract.

This theory challenged Newton’s particle theory of light.

Explanation

A covalent bond is formed when two atoms share one or more pairs of electrons.

This sharing creates a strong bond between the atoms, holding molecules together.

Explanation

Argentina,  Chile, and Colombia are all sovereign countries located on the continent of South America.

 Bulgaria is located in Southeastern Europe on the Balkan Peninsula. 

Explanation

OS/2 (Operating System/2) was initially created through a joint development agreement between IBM and Microsoft

Microsoft left the project around 1990, and development was solely continued by IBM,

Additional information 

• Windows is an operating system family developed 
• DOS developed by IBM after the split with Microsoft was OS/2.
• UNIX was originally developed in 1969 by a group of AT&T employees at Bell Labs, not IBM

Explanation

Bees must collect nectar from approximately 2 million flowers to make 1 pound of honey.

This immense effort requires bees to fly roughly 55,000 to 90,000 miles

A honey bee visits 50 to 100 flowers during a single,, dedicated collection trip.

Production Context: It takes approximately 556 worker bees to gather enough nectar for 1 pound of honey. 

Explanation

The Egyptian civilization developed along the Nile River in northeastern Africa,

It is one of the world's oldest civilizations, flourishing around 3100 BCE.

Explanation

On 22 April 2025, gunmen attacked tourists in Pahalgam,

At least 24 people were killed in India-occupied Kashmir when gunmen opened fire on a group of tourists.

Additional Information: 

After this attack, India suspended the Indus Waters Treaty 

Closed Check-post named Attari 

Asked Pakistani nationals to leave India within 48 Hours 

Explanation

Shahzaib Rind becomes KC Lightweight World Champion

In 2025, at Karate Combat KC 56.

He defeated Luis Rocha to claim the title and extend his undefeated record.

Rind had previously defended his lightweight title at KC 52 in Miami.

Explanation

50-year-old Shooter Sajid Akram along with 24-year-old Shooter Naveed Arkam,

Vsited Philipines on an Indian passport before the Bondi Beach attack

Additional Information

On 14 December 2025, an Islamic State (IS)-inspired terrorist attack occurred at Bondi Beach in Sydney, Australia,

Ahmed Al-Ahmed (43): A Syrian-born Muslim fruit-shop owner hailed as a "hero."