Matter, though divisible in an extreme degree, is nevertheless not infinitely divisible. That is, there must be some point beyond which we cannot go in the division of matter. ... I have chosen the word “atom” to signify these ultimate particles.
Interpretation
Matter has a fundamental limit to its divisibility, known as atoms.
This quote by John Dalton emphasizes the idea that matter is not infinitely divisible and that there are ultimate building blocks, which he refers to as 'atoms'. Dalton's assertion laid the groundwork for the atomic theory, suggesting that all matter is composed of these indivisible particles, fundamentally changing the understanding of chemistry and physics.
In practice
In a science lecture about atomic theory, this quote could illustrate the concept of matter.
No new creation or destruction of matter is within the reach of chemical agency. We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen.
In the past, there was active discrimination against women in science. That has now gone, and although there are residual effects, these are not enough to account for the small numbers of women, particularly in mathematics and physics.
The world of science and the world of literature have much in common. Each is an international club, helping to tie mankind together across barriers of nationality, race and language. I have been doubly lucky, being accepted as a member of both.
Whether it is to reduce our carbon-dioxide emissions or to prepare for when the coal and oil run out, we have to continue to seek out new energy sources.
Baboons have the exact physiology as humans do. They also get the same stress-related illnesses, such as ulcers and heart disease.
Every orchid or rose or lizard or snake is the work of a dedicated and skilled breeder. There are thousands of people, amateurs and professionals, who devote their lives to this business. Now imagine what will happen when the tools of genetic engineering become accessible to these people.
Sometimes I had to spend a whole day mixing a boiling mass with a heavy iron rod nearly as large as myself. I would be broken with fatigue at the day's end. Other days, on the contrary, the work would be a most minute and delicate fractional crystallization, in the effort to concentrate the radium.
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