Toy car on a ramp: how to test the effect of slope on descent time
A school experiment using a fixed distance, controlled contact conditions, five trials per slope, and video-based timing.
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Science experiments and projects with materials, hypotheses, methods, results, safety guidance, and practical steps for turning an idea into a science-fair project.
Red cabbage as a pH indicator: build a color scale with controls
Learn how to use red cabbage to compare acidity and basicity with controls, a standardized protocol, an observation table, and clear interpretation limits.
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Spaghetti bridge: how to run a fair load test and find where the structure fails
A comparable protocol for testing spaghetti bridges, measuring strength and efficiency, and identifying the first failure mode.
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Strawberry DNA: what the white strands are and what detergent, salt, and alcohol do
A guide to extracting strawberry DNA, understanding each ingredient, interpreting the white precipitate without calling it pure DNA, and setting up a useful comparison control.
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Greenhouse Effect Bottle Experiment: What It Shows — and Where the Model Misleads
A school protocol using two bottles to measure warming, control variables, and explain why the setup is not a faithful replica of the atmospheric greenhouse effect.
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Does a homemade sand-and-charcoal filter clean water? An experiment to measure turbidity without calling it potable
A science-fair protocol for testing a sand-and-charcoal filter with standardized photos, a relative turbidity scale, and one essential rule: the experimental water is not potable.
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Does a lemon battery really work? How to measure voltage, current, and power
A practical guide to turning a lemon battery into a quantitative experiment by measuring open-circuit and loaded voltage, current, power, and the reasons an LED may stay dark.
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Mostratec 2026: selected, waitlisted or accredited by an affiliated fair? What to do by Sep. 30, Oct. 6, 12 and 19
See the next step for Mostratec 2026 depending on whether your project was selected, waitlisted or came through an affiliated fair, with the deadlines and documents you cannot miss...
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Experimental error is not uncertainty: how to record measurements without false precision
A practical guide to separating error, uncertainty, resolution, and repeatability in science-fair measurements, with ruler and scale examples.
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Lab notebook for a science fair: what to record in every trial
A practical logbook model for documenting repetitions, errors, variable changes, measurements, and decisions without losing the experiment’s history.
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Table or graph for a school experiment: how to choose without distorting the data
Learn when to use a table, bar chart, line graph or scatter plot in a school experiment and how to avoid scales and axes that distort the result.
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Hypothesis vs. prediction: how to write each one from your experiment variables
Learn how to separate a hypothesis from a prediction, connect independent and dependent variables, and turn an idea into genuinely testable statements.
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Control group vs. controlled variables: the difference that prevents science-fair mistakes
Learn what a control group is, what controlled variables are, and when a school experiment actually needs a reference condition.
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Repeat or replicate? How many measurements does a school experiment need to support a conclusion?
Three measurements are not always three replicates. Learn how experimental units, repeated measurements, pseudoreplication, and sample size affect a school project.
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From a science fair idea to a testable question: variables, controls, and replication
A practical model for turning a broad topic into an experiment by defining variables, control conditions, replication, data, and safety before testing.
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