How do Astronauts communicate in space?

In order for one to hear sound it must travel through air (gas particles) of which space has very few per cubic centimeter. Sound can only travel through a solid, liquid or gas. Space being an almost perfect ...
blue sky1

Why is the sky blue in the day and black at night?

During the day (daylight) the sky has a blue appearance because the Sun’s light (white light) is made up of rainbow of colors (red, orange, yellow, green, blue, indigo and violet) of different wavelength....

What is the difference between an ocean and a sea?

Ocean and sea are two words that are used frequently and interchangeably (in writing and conversation) to mean the same thing: a continuous mass of seawater on the earth's surface. However, strictly speaking,...
popcorn kernel

Why Does Popcorn Pop?

A popcorn kernel is a cereal grain (seed). It is made up of four major physical structures: (1) The Pericarp (seed coat or outer hull): a hard outer thin covering. (2) TheEndosperm: starchy part that form...
why_burp

Why do people burp?

A burp (sometimes called a belch or by its medical term, eructation) is the release of gas from the digestive tract (in this case, theesophagus and stomach) through the mouth. It is part of the body natural c...
cold war

What is the Policy of Containment?

This is a foreign policy strategy created and executed by the US after WWII founding it's first key purpose in the Truman Doctrine of 1947. President Harry Truman warned of the evils of communism that threate...

How does sound travel?

Sound is transmitted by particles (atoms or molecules) in a solid, liquid or gas colliding with each other. It is a wave which is created by vibrating objects and propagated through a medium (solid, liquid or...
soliddf0

What is the Kinetic Molecular Theory of Matter?

The Kinetic Molecular Theory of Matter is a concept that basically states that atoms and molecules possess an energy of motion (kinetic energy) that we perceive as temperature. In other words, atoms and molec...
PLURAL FISH

When do you use the word “fish” and “fishes” ?

Some nouns have the same form in the singular and the plural and the word “fish” is such an example. As such, fish is the usual plural word for fish whereby the plural form is the same as the singular. However,...