As a science teacher, I see the same projects year after year - plant growth with different liquids, battery-powered potato clocks, etc. I want to help my students come up with more creative science fair projects DIY that still follow the scientific method but are more engaging.
What are some biology experiments DIY that would make good science fair projects? I'm looking for ideas that:
1. Can be done with minimal budget
2. Have clear variables to test
3. Produce measurable results
4. Are safe for middle school students
I'm also compiling a list of science demonstration videos to show in class as examples. If you know any particularly good ones that explain the process clearly, please share!
For original science fair projects DIY, I suggest something with bioplastics. You can make plastic from milk (casein plastic) or from potato starch. Test different recipes for strength, flexibility, biodegradability. It's relevant to current environmental issues and most students haven't done it before.
Another idea: test natural pesticides. Make extracts from garlic, chili peppers, neem leaves, etc. Apply to aphids on plants or test on fruit flies in containers. Measure effectiveness compared to commercial products or control groups.
For biology experiments DIY that are visually impressive, try hydroponics vs soil growth. Grow the same plants in both systems, measure growth rates, health, yield. Use clear containers for hydroponics so roots are visible.
Backyard science activities can make great science fair projects! One student I mentored did a project on native vs invasive plant growth rates. Collected seeds from both types, grew them in controlled conditions, measured everything - germination time, growth rate, water needs, etc.
Another cool project: study decomposition rates of different green" products vs conventional ones. Bury items like bamboo toothbrush vs plastic, compostable bag vs plastic bag, etc. Dig them up monthly to document decomposition.
For biology experiments simple enough for middle school but still original, try studying microclimates. Set up temperature/humidity sensors in different backyard locations (sunny vs shady, near house vs open field, etc.) and correlate with plant/insect diversity.
As a parent who's helped with many science fair projects DIY, I think projects that solve real problems are most engaging. One year my child tested which natural mosquito repellents work best (citronella, lavender, eucalyptus, etc.) using a simple setup with mosquitoes in screened containers.
Another good one: test water filtration methods. Make filters with sand, gravel, charcoal, coffee filters, etc. Test with muddy water or water with food coloring. Measure clarity before/after.
For science demonstration videos to show as examples, look for ones that include the scientific method clearly - question, hypothesis, materials, procedure, results, conclusion. Avoid ones that are just cool tricks" without explanation.
The bioplastics idea is really timely with all the plastic pollution discussions. I wonder if students could test how different additives affect the properties - like adding glycerin for flexibility or vinegar for strength.
For biology experiments DIY that connect to health, what about testing the effectiveness of natural antiseptics? Honey, garlic, turmeric, etc. compared to commercial antiseptics. You'd need to grow bacteria cultures first (from swabbing surfaces), then apply different treatments and measure zones of inhibition.
Has anyone found good science demonstration videos specifically about the scientific method? I find some videos skip right to the wow" factor without showing how to properly design and conduct an experiment.