Fourth Grade Science Experiments (Page 152)

Think Like a Computer: Try Machine Learning

Science Fair Project Idea

Engineering Design Process

What should you eat for breakfast today? What should you wear to school? You make many decisions every day and consider lots of information when making those decisions. What if you could train a computer to make those decisions for you using artificial intelligence? In this project, you will not need to do any computer programming yourself, but you will do some simple math to show how a computer program called a neural network can learn to make decisions. If you want to try a version of the… Read more

Throwing Away the Plan: Doing Fun Science at Home during School Closures (Activity #8)

Blog Post

Follow along with a Science Buddies parent who is using family STEM activities to keep her kids learning at home during the COVID-19 school shutdown. New posts every Monday, Wednesday, and Friday. Today's adventure... writing secret messages with invisible ink. Oops... New Plan Needed! How many plans have you made since your school closed? Are you on your first or fourth family schedule? Have you tossed all schedules out the window? We've made a… Read more

Tiling with Spidrons

Science Fair Project Idea

Scientific Method

This is a great science fair project for someone who is interested in both mathematics and art. Spidrons are geometric forms made from alternating sequences of equilateral and isosceles (30°, 30°, 120°) triangles. Spidrons were discovered and named by Daniel Erdély in the early 1970's, and have since been studied by mathematicians and artists alike. This project is a great way to learn about the mathematics and art of tiling patterns. Read more

Time to Spring Clean…Your Water!

STEM Activity

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It’s easy to take our clean water for granted, we’re so used to being able to drink from a fountain or faucet whenever we’re thirsty. But did you know that over 1 billion people in the world don’t have access to clean water? Part of the problem is that cleaning (or purifying) water is not an easy task. Not only do you need to remove dirt and other debris, you also have to get rid of all the invisible bacteria and micro-organisms that can make people sick. In this… Read more

Timing the Tides

Science Fair Project Idea

Scientific Method

Have you ever been to a tide pool during low tide? Some intertidal animals in the low tide zone are left in a tiny pool of water when the tides go out. Other intertidal animals that live in high tide zones may be left to dry out during low tide. How much time does each zone spend out of water during a tidal cycle? Read more

Tiny Titans: Can Silver Nanoparticles Neutralize E. coli Bacteria?

Science Fair Project Idea

Scientific Method

Have you ever heard that nanoparticles can kill bacteria? You may have even seen some consumer products advertise that they contain antibacterial nanoparticles. A nanometer is one billionth of a meter long. Nanoparticles are usually just a few nanometers in diameter — really, really tiny! So how can something that small kill bacteria which are approximately 700 - 1400 nanometers across? Are they really effective? In this science project you will grow some E. coli bacteria and… Read more

Tireless Tides: Extracting Energy from Ocean Tides

Science Fair Project Idea

Scientific Method

Renewable energy is the energy that is extracted from natural sources, such the Sun (solar), earth (geothermal), wind, and water (hydropower). These sources are renewable because they can be replenished by the same natural sources within a short period of time. Hydropower energy is extracted from moving water, like ocean wave energy and tidal energy. In this energy science fair project, you will make a model of a tidal barrage (also known as a dam) and investigate how emptying the tidal barrage… Read more

To Infinity and Beyond: Plan a City of the Future with Sim City.

Science Fair Project Idea

Scientific Method

Everyday, people in your city or town walk to school, ride the bus and go to work, and go to the library to research their science fair projects. But what if the library was 20 miles away from your home? Would you go to the library? What if there were no police officers or fire stations in your city, or if they were located across town, away from where most people live? What if there were no movie theaters? What would you do with your friends? Many people really like living in cities in which… Read more

Tough Beans: Which Cooking Liquids Slow Softening the Most?

Science Fair Project Idea

Scientific Method

OK, spill the beans, what's your favorite bean-rich food? Burritos? Chili? Or maybe you prefer the spicy Indian stew of lentils, known as dal? But what about fried tofu? Soymilk? Or peanut butter and jelly sandwiches? Did you know those foods come from beans as well? Beans are important to the diets of many people, and in this cooking and food science fair project, you'll learn how the liquid that beans are cooked in affects how quickly or slowly they soften. Read more

Trace Your Ancient Ancestry Through DNA

Science Fair Project Idea

Scientific Method

Did you ever wonder about your ancient ancestors? Who they were? Where they came from? In this science project, you will investigate the secrets of your distant past as revealed by your DNA. In order to obtain a sample for DNA analysis, you will scrape a soft swab inside your mouth to collect cheek cells. The cheek cell sample will be sent to a lab for processing, and the results of the analysis will be sent to you. Based on the genetic markers in your DNA, the ancient clan that your… Read more

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