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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 a nucleus – Parts of a cell – Biology

By |2017-05-29T00:35:47+00:00May 29th, 2017|Biology|

An onion skin cell (seen through a microscope) You can see the nucleus inside each cell The earliest cells, and all prokaryote cells, don't have a nucleus. Inside these simple cells, the DNA molecules just float around in the cytoplasm. This is a nice simple arrangement, but it's risky - the DNA often [...]

What is mitosis? Sexual reproduction – Biology

By |2017-05-29T00:31:28+00:00May 29th, 2017|Biology|

Eukaryote cells generally reproduce themselves using a method called mitosis. When a eukaryote cell senses that there is plenty of food around, it splits into two new cells that together can eat more food. But it's pretty complicated for eukaryote cells to divide. They have a lot of DNA molecules, to control all the different parts [...]

Eukaryotes project – Eukaryotes and Microscopes – Biology Activities

By |2017-05-28T17:37:40+00:00May 28th, 2017|Biology|

Human cheek cells (seen through a microscope at 400X) The best way to understand cells better is to look at some through a microscope. If you don't have a microscope yourself, try going to a science museum or try to raise money to get one for your school. You can also get microscope [...]