Fourth Grade Science Experiments (Page 21)

Liver Stinks!

Science Fair Project Idea

Scientific Method

Sometimes science can be really messy or use pretty disgusting ingredients. That is what it takes to understand how the world works, even if the experiment isn't pretty. Do you like chemical reactions that stink and ooze foamy bubbles? Do you think it sounds fun to make a super gross liver smoothie? Then this is the experiment for you! Read more

Make Sustainable Fabrics from Seaweed

Science Fair Project Idea

Scientific Method

Can you imagine clothing, handbags, or shoes made from seaweed or spider silk? To become more sustainable, the textile industry is looking for ways to develop more eco-friendly fabrics. Biofabrics derived from living organisms such as seaweed or bacteria have been proposed as a potential alternative to conventional fibers. In this science project, you will make several biofabrics from alginate (seaweed) and conduct tests to find out which one is most suitable as a textile replacement. Read more

Ocean Bioluminescence: Investigate When and How Dinoflagellates Glow

Science Fair Project Idea

Scientific Method

Imagine the ocean water turning bright red or seeing ocean waves glowing a beautiful blue color. Sounds impossible—but it is not! Red tides and glowing waves are caused by microscopic organisms living in the ocean called dinoflagellates. Some dinoflagellates have the ability to produce light through a process called bioluminescence. When and how do these organisms glow? In this science project, you will investigate how changing the dinoflagellate's exposure to light and dark affects its… Read more

Racing Bristlebots: On Your Mark. Get Set. Go!

Science Fair Project Idea

Scientific Method

Have you ever wanted to build your very own robot from scratch? Bristlebots are a cheap, easy, and fun-to-build robot made from the head of a toothbrush, a battery, and a small motor. Once completed, they buzz along the top of a table like bugs. How can you make a bristlebot go faster? In this project, you will build bristlebots from two different types of toothbrushes, and race them against each other to find out. Read more

Test Your Foods for Starch

STEM Activity

1

2

3

4

5

63 reviews

Have you ever heard about starchy and non-starchy foods? What is the difference? Starchy foods contain the carbohydrate starch, which is converted to sugar (glucose) inside our body for energy production. How do we know which foods contain starch and which do not? There is a simple chemical test that you can do to detect starch, which involves an iodine solution. The iodine solution turns any food that contains starch dark blue. Try this activity and watch it in action yourself! Read more

Tracking SARS-CoV-2 Spread from Wastewater

Science Fair Project Idea

Scientific Method

Have you ever wanted to know where hot spots of infection are or see how viruses spread? Are you interested in seeing how this changes over time? Check out our new science project that uses data visualization tools and tested wastewater data to track the virus that causes COVID-19 over time. Read more

Upcycle Paper Products into Plantable Seed Paper

Science Fair Project Idea

Scientific Method

Do you ever have notebooks and papers left over from the school year? Do you recycle them? What if you could use them to start your garden instead? In this science project, you will upcycle old paper into seed cards and test how paper compares to other materials as a fertilizer! Read more

What Conflicting Mental Tasks Reveal About Thinking: The Stroop Effect

Science Fair Project Idea

Scientific Method

Can you pat your head with one hand while you rub your stomach with the other? This science project idea is kind of like doing that, but this project can actually give you some insight into how your mind works. The task is to name colors. It sounds simple enough, but see what happens when color words get in the way. Read more

What's the Best Container for Elephant Toothpaste?

Science Fair Project Idea

Scientific Method

Check out this video from former NASA engineer Mark Rober, where he sets out to reclaim his title for the world's largest and tallest elephant toothpaste reaction. In the video, he experiments with different container shapes and sizes to determine which will result in the most spectacular reaction. You can turn this into a science project of your own! How do differently sized or shaped containers affect the foaming reaction? Can you find an optimal container that makes the reaction go the… Read more

16+ Engineering Challenges for Middle School

Blog Post

Inspire students to think like engineers with hands-on building and design challenges! Spark interest and build engineering design skills with one of these free engineering projects for middle school students. 16+ Engineering Design Projects to Inspire Middle School Students! Engineering design projects and challenges are a great way to ignite student interest in STEM. When students tackle an engineering design challenge, they are encouraged to… Read more

Fourth Grade Science Experiments (top 2,000 results)

Explore Our Science Videos