Bernard Nebel
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Thank you for your question. I think your son (for age almost 5) is expressing remarkably good knowledge and understanding. A perfectly logical argument can be made for paper being biological as it is made from from trees. It is quite arbitrary that we move it into the human-made category to express the role that humans played in producing it. Recognizing that everything human-made starts with resources from biological and/or natural earth categories should be a major point of this lesson.
I don’t know if this helps. Please ask further as you like.
Hello Sherrie,
Kids should have plenty of experience with pocket magnifiers before proceeding to a microscope. Then, the general type of microscope you want is shown here:You may wish to go up from here and get a mechanical stage and diaphragm condenser for better control of light, and other features as you may desire. Of course you will need slides, coverglasses, etc.
Please ask further questions as you wish.
Thank you for bringing this to my attention. I have replaced it with another video. Enjoy.
Thank you very much, “stoker”. This is a nice addition.
The Brock microscope is the one microscope that I DO NOT recommend. Focusing is very tricky. Then, when you wish to go from scanning to higher power you must disassemble, screw in the higher power lens, and refocus. Refocusing under the higher power is almost impossible.
Therefore, go with the three-lens, par focal, standard student scope, an example of which may be seen at
https://www.amazon.com/AmScope-M150C-I-40X-1000X-Biological-Microscope/dp/B00AM5XB5O/ref=sr_1_3?ie=UTF8&qid=1538751948&sr=8-3&keywords=microscopeThey are actually less expensive than the Brock.
That’s a good question. I’ve had to think about it too. In answer, I changed the question to, “What do you need to feel gravity, i.e., have a feeling of weight?” My reasoning: You need to be on a platform (something to stand or sit on) that is holding its position within a gravitational field. An airplane is holding its up/down position within the earth’s gravitational field, forward motion notwithstanding. Therefore, aboard the airplane you experience gravity much as you do on earth. Either that or you must be accelerating or decelerating so you feel the inertial force, which is indistinguishable from gravity.
Now, assume you have blasted off on a straight line mission to Mars. After gaining required speed, engines have been turned off; hence, you are neither accelerating nor decelerating so you feel no force from that. Nor is your rocket ship holding a position within a gravitational field. It may be traveling at great speed in a straight line, but it is not moving or holding a position counter to any gravitational field. Therefore, despite its straight line of travel, it and you in it are in a state of free fall within whatever gravitational field(s) are present. Therefore, you would feel weightless. Please ask further or give an alternative argument.
The following video, which shows diagrams, provides an excellent demonstration of how latitude is determined from the North Star:
Knowing that the sun, at the spring and fall equinox and at high noon (the sun at its zenith) will be 90 degrees exactly above the equator, you can do the same thing with reference to the sun. Of course, in this case, you have to subtract your measured angle from 90 degrees because the equator is designated as zero degrees latitude. By making proper adjustments, this process can be used for determining latitude at other times of the year and the day. Mariners had and still have tables for making those adjustments.
The following video may be helpful. (Thank you for you question. I hope this answers it, but please ask further.)The following video, which shows diagrams, provides an excellent demonstration of how latitude is determined from the North Star:
Knowing that the sun, at the spring and fall equinox and at high noon (the sun at its zenith) will be 90 degrees exactly above the equator, you can do the same thing with reference to the sun. Of course, in this case, you have to subtract your measured angle from 90 degrees because the equator is designated as zero degrees latitude. By making proper adjustments, this process can be used for determining latitude at other times of the year and the day. Mariners had and still have tables for making those adjustments.
The following video may be helpful. (Thank you for you question. I hope this answers it, but please ask further.)“My children tend to forget…” Your children are not unique in this, nor is it just children. We all forget things that are not brought back and refreshed now and again. Call it review, but that review does not need to be from a book. In fact there is a better way.
The whole objective of science is not to learn a bunch of facts; it is to become able to look at the real world, both natural and human-made aspects, and gain understanding as to why things are as they are and happen the way they happen. For example, suppose kids have learned about inertia (Lesson C-5). The best way to review this is not to read about it again in a book; it is to call it mind in real life situations. Why is important to fasten your seat belt? What is involved in kicking mud from your boots? … a dog shaking water from its fur?
In short, I believe the best sort of review is bring kids to consider things/happenings in the real world and with Q and A bring them to consider the “what” and “why” in terms of their learning (or perhaps formulation of questions for future learning). For ideas in doing this, see the sections in each lesson: “Questions/Discussion/Activities to Review, Reinforce, and Assess Learning” and “To Parents and Others Providing Support”.
I hope others will respond here as well.
Best, Bernie NebelThanks Peywuei for sharing your experiences with the lessons.
Dr. Nebel is away for the week, but will be interested to read your note when he returns.
Thanks again,
Thank you, Shelly, for you kind words. I have toyed with the idea of writing a math curriculum, but so far, it has gotten no further. You words inspire me that I should give it more thought, but if I do start the finished product will be a couple years down the road. Would you be interested in co-authoring it with me. (Please email me at bnebel@erols.com)
In the meantime, I hope you will consider putting a review of BFSU on Amazon or elsewhere. Bernie Nebel
You do have a very smart son. He has caught an apparent contradiction that completely escaped me. The best I can do in way of explanation is to point out that photons are an entirely different sort of “particle”, so different that they should not be considered particles at all. It is better to think of them as fundamental units or just “dots” of light energy.
The key difference is that all particles of matter have mass (a certain weight in the presence of gravity). The more particles of matter that are packed together, the greater the weight. Photons have no mass. Regardless of how many photons (how much light) you shine into a bucket, there is still no weight, and there is no way that you can pack photons together and get a mass with size and shape.
Another and very significant difference between photons and particles with mass is that light (photons) can be easily seen as waves, not particles. A simple activity described in the text explains how to do this. Even physicists have no way to explaining why/how photons behave as both waves and particles, but it definitely sets them apart from atoms and larger particles of matter.
In conclusion, photons can not be considered as particles in the same sense as particles of matter.
The second part of your post is also significant. Please reread “Students’ Questions and Suggested Responses, Type 5 Questions” (page 19, Vol. I, 2nd ed.)
This may well raise further questions. Please ask them.
Hi “Theblueanura”,
In response to “I don’t have a way to know what the background knowledge [of my students is], I suggest conducting a brief Q and A regarding a given lesson. Use the list of items under “Practices: Students who demonstrate understanding can:” as a basis for your questioning. Students’ responses will demonstrate their understanding or lack thereof, and it will also expose misconceptions that they may have. This can lead into the lesson itself, or aspects of the lesson that need clarification. If they show full mastery, you can immediately move on the next lesson in the same manner. At worst this will be a significant review.
This does assume that you have familiarized yourself with the lessons and have materials/equipment for teaching/demonstrations at hand to begin addressing gaps that students expose. Utilize the links provided under specific lessons in BFSU community.com.
I confess that I am confused by your implying that all the D lessons involve “year long observational studies”. This is true for lesson D-6 only. All the others can be compressed into a 45 session if you are well prepared with necessary materials at hand. I do hope that you will make more contact with the person you know who does this.
I hope this helps, but please ask further.
Bernie NebelIf kids have not been exposed to and learned the basic ideas and concepts presented in Volume I, they are a good and necessary starting point for any age regardless of grade. The core idea/concept of any lesson can be presented in a manner that is age appropriate.
Please don’t hesitate to ask further as you proceed.
Bernie Nebel
Thank you for your comment and question, “kunchik”. My effort here is to view the world as a child views it and then to help them gain comprehension and understanding as to what they see. They readily see and interact with living/biological things, natural earth things and materials (rocks, air, water), and they also see and interact with all sorts of things and materials that are made/constructed by humans.
The core idea of the lesson, however, is to go beyond the simple categorization and get kids to recognize that anything/everything human-made starts with one or more things/materials from the biological or natural earth categories. Nothing can be made from nothing! (See the discussion portion of the lesson.) This is a basic concept that is foundational to all industry and technology. It is also central to the concepts of conservation, preservation, ecology and other areas.
I welcome further discussion. Bernie Nebel
