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What is Christian mass? Christianity – Religion

By |2017-08-22T14:16:43-07:00August 22nd, 2017|Religion|

Catholic priests celebrating Mass The central part of Christian life in antiquity and the Middle Ages was the Christian Mass. That was when you went to church and the priest went through a series of prayers to God. You would participate in some of the prayers. Sometimes you just said Amen at the end. Other times you called out answers - [...]

What is Christian communion? History of religion

By |2019-04-21T08:03:09-07:00August 21st, 2017|Religion, Romans|

Maybe our earliest image of the Last Supper - from the Catacombs of Domitilla, 100s AD The Last Supper At the Last Supper, Jesus gave his disciples bread and wine. What's the Last Supper? History of Passover History of Christianity Roman religion All our ancient Rome articles Jesus appears to Peter Then shortly after Jesus was crucified, [...]

What is inertia? Physics – Science

By |2018-05-31T11:49:29-07:00August 18th, 2017|Physics|

The bus is heavy, so it's hard to get it moving. A law of physics first suggested by the Uzbek scientist Ibn Sina about 1000 AD states that "an object at rest tends to remain at rest, and an object in motion tends to remain in motion." Scientists call these tendencies inertia. Inertia is a way of measuring [...]

Brown dwarf stars – Space science

By |2019-02-24T19:58:01-07:00August 17th, 2017|Physics|

What a brown dwarf might look like up close What is a brown dwarf star? The very beginning of a star forming is a brown dwarf: a star that hasn't gotten enough mass together yet to begin nuclear fusion. More about nuclear fusion Different types of stars What are stars made of? All our physics articles [...]

Black holes – Space science – Physics

By |2019-02-20T19:38:04-07:00August 17th, 2017|Physics|

A starry sky with the Milky Way galaxy (thanks to Bernd Nies) - there are probably black holes in there somewhere! What is a black hole? A black hole is a place in space where there is a huge amount of mass in a very small area. More about space What is mass? All our physics articles Why [...]

Acceleration – simple physics

By |2018-05-31T11:49:28-07:00August 17th, 2017|Physics|

Tegla Loroupe, Kenyan runner Acceleration is how much your speed changes in a certain amount of time. Picture yourself standing in front of your house. When you stand still, your acceleration is zero. When you begin to walk, your speed is changing - that's what acceleration is - it measures how fast your speed [...]

Radioactivity and nuclear physics

By |2018-04-24T14:44:18-07:00August 17th, 2017|Physics|

A Japanese girl who lost her hair from radiation sickness from the atomic bomb Americans dropped on Hiroshima Some atoms are naturally radioactive, especially atoms of uranium and plutonium. These atoms have so many protons and neutrons that even the strong nuclear force is barely strong enough to hold them together, and they sometimes lose a proton or a [...]

Newton’s Second Law of Motion – Physics

By |2018-05-31T11:49:28-07:00August 17th, 2017|Physics|

How hard will the ball hit the catcher's glove? It depends how big the ball is. how fast the pitcher throws it, and how far away the catcher is. Like the First Law of Motion, the Second Law of Motion started out with work in the medieval Islamic Empire, about 1000 AD in [...]