Fourth Grade Videos (Page 67)

Tacoma Narrows Bridge Collapse

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The Tacoma Narrows Bridge is a pair of twin suspension bridges that span the Tacoma Narrows strait of Puget Sound in Pierce County, Washington. The bridges connects the city of Tacoma with the Kitsap Peninsula and carry State Route 16 (known as Primary State Highway 14 until 1964) over the strait. Historically, the name "Tacoma Narrows Bridge" has applied to the original bridge nicknamed "Galloping Gertie", which opened in July 1940 but collapsed because of aeroelastic flutter four months…

Technology Size Comparison 3D Animation

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How small is a TRANSISTOR exactly? Companies like Intel and AMD talk about transistors being 2 or 3 nanometers large, but is that actually how small they are? In this video, we're going to zoom in on the smallest devices and technologies that drive our modern world. If you're wondering why some devices are out of order in regards to size, here's the reason. The order of devices shown is primarily organized by decreasing size, however sometimes we prioritize the year in which the technology…

Telescope Building with John Dobson

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Step-by-step making of A Dobsonian telescope.

Test Different Pinwheel Designs

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Step-by-step instructions to make three different pinwheels, each with a unique blade design, and then test how fast each pinwheel spins. By following the steps in this fun science activity video, you will discover how pinwheel blade shape relates to turning speed and understand the connection between pinwheels and wind turbines.

Test Your Foods for Starch

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Test foods for starch by following along with the simple experiment steps in this video.

The Ambiguous Cylinder Illusion

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Is this shape a circle, a square, or both? The 3D printed "ambiguous cylinder" illusion by Prof. Kokichi Sugihara seems impossible. Learn how it works and how to make your own at Science Buddies: https://www.sciencebuddies.org/stem-activities/ambiguous-cylinder-illusion?ytid=mn_-XdmyMuA&ytsrc=description Short version of the video: https://youtube.com/shorts/fYJolHtgWuw Also check out the Impossible Arrow illusion: https://youtu.be/D54yMlIMN80 Science Buddies also hosts a library of…

The Carbon Cycle Process

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What is the Carbon cycle? The carbon cycle is one of several biogeochemical cycles found on Earth. Carbon is found in almost all living organisms and makes up around .04 percent of our atmosphere. What are the steps of the carbon cycle and how does the Carbon cycle work? Carbon may travel several paths including, The atmosphere, the terrestrial biosphere, the earth’s interior which includes the lithosphere, the ocean, and human influence like burning fossil fuels and other objects that store…

The First Cartoon: Make Your Own Thaumatrope!

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Do you know what a thaumatrope is? It is a fun toy and the great-grandfather of the modern cartoon! This video will show you how to make and test your own thaumatrope and will teach you a little bit about how our vision works, too! Written instructions are available on our website at https://www.sciencebuddies.org/stem-activities/thaumatrope?ytid=YDrcVgKGp_0&ytsrc=description Science Buddies also hosts a library of instructions for over 1,000 other hands-on science projects, lesson plans, and…

The History of DNA Barcoding

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A DNA barcode is a DNA sequence that uniquely identifies each species of living thing. Dr. Mark Stoeckle from The Rockefeller University talks about the history of DNA barcoding, from the first paper published in 2003 to the international consortium of researchers that exists today.

The Impossible Arrow Illusion

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The "impossible arrow" illusion by Prof. Kokichi Sugihara seems to break the laws of physics. The arrow always seems to point in one direction when you try to rotate it, but its reflection in a mirror points the other way! Learn about the illusion, how it works, and how to make your own 3D printed impossible arrow at Science Buddies: https://www.sciencebuddies.org/stem-activities/impossible-arrow-illusion?ytid=D54yMlIMN80&ytsrc=description Short version of the video:…

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