Ninth Grade, Human Biology & Health Science Experiments (Page 13)

Don't Get Burned! Measure the UV Index at Different Times of the Day

Science Fair Project Idea

Scientific Method

It's true that the light from the Sun provides the heat and light we need to survive here on Earth, but it also poses a threat. Ultraviolet (UV) rays in sunlight cause damage that can lead to early skin aging and even skin cancer. In this science fair project, find out when you need the most protection from UV rays by using a personal UV monitor to measure how the level of ultraviolet light changes during different parts of the day. Read more

Fancy Foams with Shampoo Science

STEM Activity

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Do you like your hair shiny and beautiful? The key to keeping your hair nice and clean is to use a good shampoo. But what exactly makes a good shampoo? You might be surprised to hear that every new shampoo has to pass lots of scientific tests before it is considered good enough to be sold. Many different shampoo recipes are compared to decide which one is the best for the consumer. One of these tests assesses the foaming behavior of the shampoo. You probably trust a shampoo that makes lots of… Read more

How Can Vaccines Be Used to Fight Outbreaks?

Science Fair Project Idea

Scientific Method

Stopping a viral outbreak like COVID-19 takes more than luck, it takes public health tools. Vaccines are considered to be one of the best public health tools, which is why there is often a rush to develop good vaccines for newly discovered viruses, particularly those that have the potential to infect lots of people. Recent examples include COVID-19, Zika virus, and Ebola. If enough people are vaccinated, an effective vaccine can help stop outbreaks or even eradicate (completely get rid of) a… Read more

How Sour or How Sweet is Your Lemonade?

STEM Activity

Cooking is a fun and rewarding activity, allowing you to be cook and a scientist at the same time, experimenting with endless taste combinations! The five tastes humans can experience are: sweet, sour, salty, bitter and umami. But have you ever experienced some combinations that were delicious and others that were downright yucky? How do cooks come up with delicious recipes, and even more amazingly, how can they replicate the same exact flavors over and over again? Does science have anything to… Read more

How to Help Pass Gas

STEM Activity

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Has your stomach ever ached so bad you felt as if it was blown up like a balloon—maybe after the big Thanksgiving meal? You may have had a large amount of gas trapped in your stomach and intestines. But where does the gas come from that makes you feel so uncomfortable, and how does it disappear again? In this activity, you will blow some bubbles to investigate how a specific medicine can help you feel better, so next time your tummy hurts because you are bloated, you will know how to cure… Read more

How Warm is Just Sweet Enough?

STEM Activity

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Can you recall how a piece of warm apple pie or a cup of hot chocolate milk tastes when you let it cool? Maybe you even prefer to have these treats at room temperature. Why is this? Can flavor change even when you are not adding ingredients, cook or bake it? Try this activity and discover how temperature influences flavor! Read more

Model How R naught (R₀) Shapes an Epidemic

Science Fair Project Idea

Scientific Method

Even during a global pandemic like COVID-19, there are differences in how the epidemic unfolds within communities. Some communities see early, large waves of infected individuals, while others see smaller numbers of infections over a longer period of time, and others may not appear to have an epidemic at all. Could R₀ (pronounced R naught), account for some of this variation? R₀, the basic reproduction number of a disease, quantifies how many people, on average, an infected… Read more

Play a Memory Game with Your Nose!

STEM Activity

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Take a deep breath: freshly baked cookies, smoke from a wood fire, or a bouquet of roses—your nose is an amazing smell detector! Your sense of smell can not only identify a huge variety of odors, but it is also incredibly sensitive. Think about how easily you can detect if someone in your neighborhood has a barbecue just by smelling hints of smoke from a faraway grill. But how good is your nose when it comes to differentiating individual smells? Do this activity to find out! … Read more

Scentsational Memories

STEM Activity

Did you know that approximately 2 million people in the United States have no sense of smell? Lack of smell is a disorder known as anosmia, and can be caused by damage to the nerves that transmit information from your nose to your brain. Our sense of smell serves an important purpose, we use it to distinguish between edible and inedible items in our lives, including fresh or rotten foods, and even particular toxins that have strong, unpleasant smells. In this activity you will test the scent… Read more

Seeing Science: The Size of the Full Moon Rising

STEM Activity

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Have you ever noticed how the moon appears bigger at the horizon, just as it is rising over the treetops, than it does later in the evening when it is overhead? Of course, the size of the moon does not change, but our perception of its size changes based on where it is in the sky. In this activity, you’ll investigate Emmert’s law, which helps explain the full moon illusion, and estimate the size of the perceived increase in size of the moon at the horizon. Then you… Read more

Ninth Grade, Human Biology & Health Science Experiments (136 results)

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