![]() ![]() ![]() My kids know economic ideas that I didn’t even understand until we read the book together. We were walking down the chip aisle when my son pointed to the 18 kinds of potato chips and said Hey, that’s spontaneous order! I kid you not. CONTACT BOOK SERIES FREEOne mom wrote us this: “I took my kids to the grocery store a few days after we read one of the Tuttle Twins books about free markets. These stimulating stories encourage children to make sense of the world-and we’ve heard so much fun stories about how this is working so well. The Tuttle Twins books challenges children to learn “adult” ideas-and they love it! We explain these ideas simply, and with helpful illustrations… and we’ve been amazed at how well kids rise to this challenge. The books teach relevant freedom-based concepts that most of us were never taught as kids. There aren’t any other children’s books that present a vast array of free-market topics in such a fun way. CONTACT BOOK SERIES SERIESThe Tuttle Twins’ Book Series Introduces Important Ideas That Schools Don’t Teach. That’s why we created the Tuttle Twins books! (See examples below!)Īnd what’s critical is that we empower our children to understand these time-tested principles so that they can recognize and reject the brainwashing they will be bombarded with in the world.įortunately, parents like you don’t have to do this alone. Take it from me - I’ve been blown away at how well kids understand and love these ideas when you explain them simply, with fully illustrated, fun stories. Īnd freedom-loving parents like you might question whether your kids could be interested in-and understand!-these real-world concepts. That’s why we’ve made it our mission to create books and curriculum materials that teach students the values of a free society- ideas that support your family values. You find yourself asking, “What exactly are my children learning at school…?”Īnd even if you homeschool, you are always on the hunt for a new curriculum to make sure your children are being taught good principles and true ideas.īut most curriculum is dumbed down and leaves out the essential civic truths that children and adults need to know. ![]()
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![]() ![]() The density of ice is about 90 percent that of water, but that can vary because ice can contain air, too. ![]() Again, lucky for us, as we would not hear that delightful tinkle of ice cubes against the side of a glass if the ice in our ice tea sank to the bottom. It happens that the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water. Ice actually has a very different structure than liquid water, in that the molecules align themselves in a regular lattice rather than more randomly as in the liquid form. The best way to visualize how water can have different densities is to look at the frozen form of water. Most of an iceberg exists below the water surface. Sources/Usage: Some content may have restrictions. Upon freezing, the density of ice decreases by about 9 percent. This is due to ice's density being less than liquid water's density. This is not a surprise, but actually almost all of the volume of an iceberg is below the water line, not above it. If you look at this picture you can see that some of the iceberg is below the water level. The Water Encyclopedia, Third Edition, Hydrologic Data and Internet Resources, Edited by Pedro Fierro, Jr.Īnd Evan K. Department of the Interior, Bureau of Reclaimation, 1977, Ground Water Manual, from ![]() So, when they demanded another gallon of water, I consulted the "Internet" of that day-an encyclopedia- and found out that a gallon of water at the boiling point only weighed 7.996 pounds! I ran up the hill carrying my gallon of water that weighed 0.333 pounds less and ran back down even faster, their angry voices fading behind me. That gallon of tap water at 70☏ weighed 8.329 pounds, which was a lot for a 70-pound kid to haul up a huge hill. They got thirsty and made me go back home and bring them a gallon of water. One hot summer day they climbed the huge hill next to our house to dig a hole to hide their bottle-cap collection. I was able to use water density once to at least play a trick on them, though. Growing up with an older brother was difficult, especially when he had his friends over, for their favorite activity was thinking of ways to antagonize me. The rounded value of 1 g/ml is what you'll most often see, though. A common unit of measurement for water's density is gram per milliliter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm 3).Īctually, the exact density of water is not really 1 g/ml, but rather a bit less (very, very little less), at 0.9998395 g/ml at 4.0° Celsius (39.2° Fahrenheit). Density is just the weight for a chosen amount (volume) of the material. As long as an object is made up of molecules, and thus has size or mass, it has a density. The definition of density, makes a lot more sense with a little bit of explanation. If you're not still in school, then you probably forgot you ever even heard it. On Earth, you can assume mass is the same as weight, if that makes it easier. If you're still in school, you've probably heard this statement in your science class: " Density is the mass per unit volume of a substance". ![]() ![]()
![]() Gravity, however, closes the bridge before it can be traversed.īernard Schutz, Gravity from the Ground Up (Ĭambridge, 2003). In particular, it makes travel appear possible from one side of the bridge to the other. Furthermore, the bridge is misleading in that it contains none of the gravity, and resulting dynamics, of a black hole. The Einstein Rosen bridge applies only to black holes that were cast into the initial structure of the universe, not to black holes that formed as the result of stellar collapse. A picture of the Einstein Rosen bridge can be found as Fig. The particle problem in the general theory of relativity,” Phys. Those authors, in a paper more related to classical mechanics than to relativistic gravity, state “… it is hard to argue that the conceptual analogy of a marble rolling on a warped fabric does not benefit the beginning student of general relativity.” We make precisely that argument here, and find it easy as well as compelling. This article takes a strong stance in direct opposition to that inĬircular orbits on a warped spandex fabric,” Am. 3, but in the following subsection (“A Few Caveats”) he points out the shortcomings of the analogy and the ways in which it may be misleading. Greene presents the rubber membrane bowling ball analogy in a subsection of Chap. ![]() An excellent example of this can be found in The probability of confusion is near certainty. Among other wildly misleading aspects of this “model” is the fact that it is Earth gravity pulling the bowling ball down and hence deforming the rubber sheet. ![]() |
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