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24 08, 2017

What is a rabbi? Judaism – Religion

By |2018-09-10T09:58:12-07:00August 24th, 2017|Religion, West Asia|0 Comments

The rabbi Maimonides, in a later medieval painting What does "rabbi" mean? Rabbi means "great one" in Hebrew, or "respected one". It's a Hebrew word related to the Arabic word rabb, meaning "lord." Saying "Rabbi" showed respect, like calling someone "Sir". More about the Hebrew language When did the word "rabbi" get started? In [...]

21 08, 2017

What is baptism? – History of Christianity

By |2019-02-10T06:06:07-07:00August 21st, 2017|History, Religion, Romans|1 Comment

Torchlight parade (this one is actually in India) Baptism before Christianity Even before the time of Jesus, many mystery religions of the ancient Mediterranean had some sort of ceremony that people had to do in order to join the cult. Some of these, like the Eleusinian mysteries, involved dipping yourself in water to wash away your past life, and [...]

17 08, 2017

What is work? Physics definitions

By |2018-05-31T11:49:15-07:00August 17th, 2017|Physics|0 Comments

Ancient Egyptian cattle plowing (Louvre Museum, Paris) You might think you know what work is, like homework, or having to pick up your room, right? But to scientists, work has a more definite meaning: work is force x distance. That means that you can measure work by measuring how much force, or energy, [...]

16 08, 2017

What is a light-year? Physics definitions

By |2018-05-31T11:49:14-07:00August 16th, 2017|Physics|0 Comments

Light takes years to reach us from these stars far away in space. A light-year is the distance that light can travel in one year - that is, in the time it takes the planet Earth to make one full trip around the Sun. Light travels 186,000 miles in a second, so in [...]

1 08, 2017

What is feudalism? Definition of medieval feudalism

By |2019-06-08T07:07:39-07:00August 1st, 2017|Government, Medieval|1 Comment

Medieval feudalism: Harold swears an oath to William (Bayeux Tapestry, about 1077 AD) What is feudalism? Feudalism is a way to govern a large state when the king is poor and not very powerful, and when there aren't good roads so it is hard to communicate with people who live far away at the other end of [...]

29 07, 2017

What is area? Simple geometry

By |2017-07-29T13:29:39-07:00July 29th, 2017|Math|0 Comments

Calculating the area of your room. The area of a room is the size of the floor. Suppose you wanted to find out whether your room was really bigger than your brother's room. You'll need to measure your room, and his room. Suppose your room is ten feet long and fifteen feet wide, [...]

29 07, 2017

Solids – Platonic solids – Geometry

By |2017-07-29T13:08:07-07:00July 29th, 2017|Math|0 Comments

Pyramid Just as a plane is made of an infinite number of lines, a solid is made of an infinite number of planes. These planes are right next to each other, like a stack of paper. A solid has width, and length, and thickness.If you looked at a solid from the side, it would look [...]

29 07, 2017

What is a rhombus? Simple geometry

By |2018-04-23T16:01:48-07:00July 29th, 2017|Math|0 Comments

This is a rhombus, divided so you can figure out the area. A rhombus is a kind of quadrilateral that has two sides that are parallel to each other, and another two sides that are parallel to each other. A rhombus is a special kind of parallelogram, and squares and rectangles are special kinds of rhombus. To figure out the perimeter of the rhombus, you [...]

29 07, 2017

Rectangle – area and perimeter

By |2018-04-23T16:01:22-07:00July 29th, 2017|Math|0 Comments

This is a rectangle. A rectangle is a flat shape, in one plane. It's defined by four points at the four corners. A rectangle has two sides of equal length opposite each other, and two other sides of equal length opposite each other, and four corners, all right angles (90 degree angles). A square is a special kind of rectangle. [...]

29 07, 2017

What is a pyramid? Square pyramids

By |2017-07-29T11:57:36-07:00July 29th, 2017|Math|0 Comments

A pyramid with a square base. A pyramid is a three-dimensional solid form made out of triangles. Some pyramids also use a square. There are two common kinds of pyramids: triangular pyramids that you make by fitting four triangles together, and square pyramids that you make by fitting four triangles together on a square base, like the [...]