By Jim Wiese
Dig into the technological know-how of precedent days and unearth impressive discoveries!
* have you puzzled the place paper comes from, who made the 1st recognized maps, or how the traditional Egyptians have been capable of construct the pyramids?
* do you want to make your personal sundial, notice how one can realize earthquakes, or learn how to write in hieroglyphics?
* Are you trying to find nice principles to your subsequent technology reasonable venture?
in case you responded "Yes" to any of those questions, then historical technological know-how is for you! From Greek lighthouses and Roman bridges to chinese language kites and Mesopotamian cleaning soap, you will examine a number of the maximum clinical discoveries and the folk who brought them to the area. Dozens of fun-packed actions assist you see for your self how the earliest people cultivated crops, why tools make diversified sounds, how fireworks get their explosive strength, and lots more and plenty extra. all the initiatives are secure and simple to do, and all you would like is daily stuff from round the condominium. So step again in time and take an awesome trip with historic technological know-how!
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Should you cross outdoors on a windy day, you recognize simply how robust air should be. it might probably carry a kite excessive within the sky and seize onto a balloon and hold it away. yet even if the air is calm, you could suppose its energy and resistance if you happen to movement. "How Do airplane Fly? " finds the technological know-how in the back of air strain and flying every thing from hot-air balloons to helicopters to jet plane via attention-grabbing full-color photo and illustrations, in addition to via textual motives of real-world examples.
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Additional info for Ancient Science. 40 Time-Traveling, World-Exploring, History-Making Activities for Kids
The whey will ﬂow through the strainer into the bowl, while the curds will remain in the strainer. 3. Pour the curds from the strainer back into the pan and add 1⁄4 teaspoon (1 ml) of baking soda. Stir gently. Don’t be surprised if the baking soda reacts with any leftover vinegar by bubbling. 4. Slowly add water, a small amount at a time, to the mixture until the resulting glue is the right consistency for your use. 5. Test your glue by pasting two pieces of paper together. Explanation Your glue should be able to hold two pieces of paper together.
Marks on the ground were used to tell the time. The shadow clock was easier to make, but was less accurate due to seasonal changes. The Egyptians were the ﬁrst to split the time period between sunrise and sunset into 12 equal parts. They also divided the night into 12 equal parts. From this division came the length of time we call the hour and the fact that a day has 24 hours. qxd 12/12/02 7:00 PM Page 43 PROJECT 5 Hieroglyphics he ancient Egyptians may have had the ﬁrst Twritten language. E. The Sumerians developed their own written language, called cuneiform, at about the same time.
Design and build other ways to make the jar and weight move up and down. qxd 12/13/02 2:33 PM Page 56 Explanation When you release the closed end of the tubing, the jar and rock sink in the water. When you blow into the tube, the jar and rock rise up in the water and ﬂoat to the surface. In this project, you have built a simple diving bell, a bell- or bucketshaped container that traps air inside when it’s put in water upside down. When the jar and rock are ﬁrst placed in the water and the tube is pinched, the air pressure in the jar is equal to the pressure of the water in the tub, and your diving bell ﬂoats.
Ancient Science. 40 Time-Traveling, World-Exploring, History-Making Activities for Kids by Jim Wiese