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Rebecca W. Keller, Ph.D., incorporated Gravitas Publications Inc in 2003 to develop and publish core sciences curriculum under the Real Science-4-Kids imprint. She has authored and published Real Science-4-Kids student texts, teacher manuals, and student laboratory workbooks in chemistry, biology and physics to serve kindergarten through ninth grade, available through mainstream and home ...
In 1665, Robert Hooke referred to the building blocks of all living organisms as "cells" (published in Micrographia) after looking at a piece of cork and observing a structure reminiscent of a monastic cell; [4] [5] however, the cells were dead. They gave no indication to the actual overall components of a cell.
Science education is the teaching and learning of science to school children, college students, or adults within the general public. The field of science education includes work in science content, science process (the scientific method), some social science, and some teaching pedagogy.
There is a simple division of labor in cells—genes give instructions and proteins carry out these instructions, tasks like building a new copy of a cell, or repairing the damage. [6] Each type of protein is a specialist that only does one job, so if a cell needs to do something new, it must make a new protein to do this job.
Homochirality is an obvious characteristic of life on Earth, yet extraterrestrial samples contain largely racemic compounds. [7] It is not known whether homochirality existed before life, whether the building blocks of life must have this particular chirality, or whether life must be homochiral at all.
Astronomers using the Gaia space telescope have located two ancient streams of stars that helped the Milky Way galaxy grow and evolve more than 12 billion years ago.
Among the many-celled groups are animals and plants. The number of cells in these groups vary with species; it has been estimated that the human body contains around 37 trillion (3.72×10 13) cells, [7] and more recent studies put this number at around 30 trillion (~36 trillion cells in the male, ~28 trillion in the female). [8]
The search for missing hiker Susan Lane-Fournier, 61, took a tragic turn after her body was found over the weekend in Welches, Oregon, an unincorporated community at the base of Mount Hood.
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