cells

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6 09, 2017

Human organs: medieval science

By |2019-09-15T21:13:36-07:00September 6th, 2017|Biology, Science|0 Comments

Chinese drawing of the human organs (about 1200) Eyes and fevers Between the Middle Ages and modern times, doctors have learned a lot of new things about how human bodies work. Earlier history of the human body History of medicine History of science All our biology articles The Islamic doctor al-Tabari, in the early 800s, [...]

18 08, 2017

Earthquakes and algae – the planet Earth

By |2019-05-22T14:05:38-07:00August 18th, 2017|Physics|0 Comments

Molten lava: the beginnings of planet Earth What is the Earth made of? Most of the molecules that smashed together to make the Earth were iron. The smashing together released a lot of heat, so the whole center of the planet Earth is made of hot melted iron. How old is the Earth? What is [...]

17 08, 2017

Radioactivity and nuclear physics

By |2018-04-24T14:44:18-07:00August 17th, 2017|Physics|0 Comments

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 [...]

23 06, 2017

What happened in the Archaean Eon?

By |2019-01-31T05:48:29-07:00June 23rd, 2017|Geology|4 Comments

Archaean Eon: A volcano erupts out of the water The beginning of the Archaean Eon After the end of the Hadean Eon is the beginning of the Archaean Eon. That's about 3.8 billion years ago. Earth was still about three times as hot as it is today. But it was no longer hot enough to [...]

2 06, 2017

What is a protein? Organic chemistry

By |2017-06-02T23:46:07-07:00June 2nd, 2017|Biology, Chemistry|0 Comments

Proteins are a type of molecule made mainly out of hydrogen and carbon atoms. They are combinations of smaller molecules called amino acids. The first amino acids probably developed into proteins more than four billion years ago on Earth, possibly with the help of ribonucleic acid, or RNA. We don't know whether this process has happened on [...]

2 06, 2017

What is water made of? Molecules and chemistry

By |2017-06-02T18:02:44-07:00June 2nd, 2017|Chemistry|0 Comments

A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded in a supernova. There were a lot of hydrogen and oxygen atoms floating around in these nebulae, and when they stuck together that [...]

2 06, 2017

What is sulphur? Atoms, elements, chemistry

By |2017-06-02T17:25:58-07:00June 2nd, 2017|Chemistry|0 Comments

Diagram of a sulphur atom Sulphur atoms fall near the middle of the scale: they are heavier than silicon but lighter than iron. Every atom of sulphur has 16 protons and generally 16 neutrons. Like silicon and iron, all atoms of sulphur are made inside stars that are getting older and have used [...]

2 06, 2017

What are hydrocarbons? Simple chemistry

By |2019-09-05T17:44:58-07:00June 2nd, 2017|Chemistry|0 Comments

A model of a methane molecule - the simplest of hydrocarbons A kind of molecule Hydrocarbons are molecules. They are made out of hydrogen atoms and carbon atoms. Methane is the simplest hydrocarbon molecule. It's just one carbon atom with four hydrogen atoms stuck to it. What is hydrogen? What is carbon? More [...]

29 05, 2017

Evolution of Cells – Biology

By |2018-04-13T17:03:50-07:00May 29th, 2017|Biology|0 Comments

A mutated snake with two heads With all these new molecules like lipids, amino acids, RNA, and protein floating around in the oceans by around four billion years ago, there were a lot of new possibilities for what could bump into what. Sometimes a group of lipid molecules happened to stick together and [...]