Explanation

Penicillin was discovered by Alexander Flaming In 1928.

Penicillin was the first true antibiotic.

The first patient Albert Alexander, a 43-year-old policeman, was treated with penicillin on 12 February 1941.

Alexander Flaming determined that penicillin had an antibacterial effect and published his findings in 1929.

Explanation

The lifespan of a red blood cell is around 120 days.

Blood cells are made in the bone marrow.

Explanation

The human body typically has 206 bones

At the time of birth, there are 270 bones which fuse with time to come to a total of 206 bones.

The total bones of our body can be divided into:

• the axial skeleton (80) 
• the appendicular skeleton (126)

The newborn child has 300 bones.

Longest bone: Femur (thigh bone)

Shortest: Stapes (one of the 3 small bones inside the ear)

The human head has 22 bones.

Explanation

Light Year is the distance that light can travel in one year.

The distance light travels in one year is known as light year.

Explanation

GPS is an abbreviation of Global positioning system

***

The Global Positioning System, originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. 

The GPS (Global Positioning System) is a "constellation" of 31 well-spaced satellites that orbit the Earth

Coverage: Global

Cost: $12 billion; (initial constellation); $750 million per year; (operating cost)

First launch: February 22, 1978; 44 years ago

Orbital height: 20,180 km (12,540 mi)

Regime(s): 6 MEO planes

****

Explanation

The hardest substance in the world is diamond.

Its hardness is due to the strong covalent bonding between its carbon atoms.

This making it the most resistant to scratching.

Category: Native minerals

Cleavage: 111 (perfect in four directions)

Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)

Crystal habit: Octahedral

Crystal system: Cubic

Dana classification: 1.3.6.1

Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Explanation

The Sun is a star.

There are lots of stars, but the Sun is the closest one to Earth.

It is the center of our solar system.

The Sun is a hot ball of glowing gases.

The sun is composed of layers made up almost entirely of hydrogen and helium.

Explanation

• Mars is referred to as the Red Planet.
• It has rivers, streams, lakes, and oceans.
• It has the largest volcano Olympus Mons.
• It has two moons; Deimos and Phobos.

Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D, which is essential for bone health, immune function, and the regulation of calcium levels in the blood.
• Deficiency of Vitamin D results in Rickets.

Explanation