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Radioactivity and nuclear physics

By |2018-04-24T14:44:18+00:00August 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 [...]

What is electricity? Physics

By |2018-06-01T10:27:39+00:00August 16th, 2017|Physics|

What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms.  Those atoms are made of electricity. Atoms are made of even smaller particles called protons, neutrons, and electrons. Electricity is electrons that have gotten loose from their atom. (More about electrons) The protons and neutrons [...]

What is the strong nuclear force? Atoms and Physics

By |2018-04-16T23:47:52+00:00June 2nd, 2017|Physics|

Diagram of an iron atom The protons inside the nucleus of an atom all have a positive electrical charge, so they push away from each other. But the strong nuclear force pulls the protons together. As you might think from the name, the strong nuclear force is very strong. It is stronger than [...]

What are quarks? Nuclear physics and science

By |2018-04-24T14:44:13+00:00June 2nd, 2017|Physics|

What are quarks? Tiny particles found all over the universe. What are quarks? Quarks and electrons are the tiniest particles. There are three quarks in every proton and three in every neutron, and protons and neutrons are the pieces of an atom. We can't see a quark, even with an electron microscope, but [...]

What is a proton? Atoms and Chemistry

By |2018-04-24T14:44:15+00:00June 2nd, 2017|Chemistry, Physics|

Autzen Stadium, in Eugene Oregon, seats 54,000 people A proton is a tiny particle, smaller than an atom. Protons are too small to see, even with an electron microscope, but we know they must be there because that's the only way we can explain how atoms behave. To give you an idea how [...]

What are atoms? Simple science – Chemistry

By |2018-05-31T11:49:28+00:00June 2nd, 2017|Chemistry, Physics|

Lithium, cobalt, and oxygen atoms (as in a lithium-ion battery), seen under an electron microscope from Berkeley Labs Atoms are collections of tiny bits of matter, particles which we call protons, neutrons, and electrons. These particles are made of even smaller particles called quarks. But even protons, neutrons, and electrons are so small you [...]

How do cells move around? Cell biology

By |2018-04-16T00:35:41+00:00May 29th, 2017|Biology|

Bacterium with a flagellum(under a microscope) The simplest cells, developing about four billion years ago, had no way to control their own movement. They lived in the oceans, and they floated wherever the water took them. Sometimes they found food there, and sometimes they didn't. Many cells still live this way. By around [...]