I set up two identical containers of soil. I planted bean seeds in both, but I added a liquid fertilizer to the first and only plain water to the second. I measured their height every day for three weeks to see which grew taller., Chemistry: Observing a liquid reaction, Biology: Studying plant growth variables, Geology: Analyzing soil types, Physics: Measuring the force of growth, I built a small ramp and covered half of it with smooth plastic and the other half with rough sandpaper. I timed how long it took for a marble to roll down each side to see which surface slowed it down more., Biology: Testing animal movement, Astronomy: Simulating planetary orbits, Physics: Investigating friction, Chemistry: Testing material density, I mixed a clear liquid with a white powder in a beaker. Immediately, the mixture began to fizz and produce bubbles, and the beaker felt cold to the touch. I was recording the signs that a new substance was being formed., Physics: Measuring heat transfer, Chemistry: Observing a chemical reaction, Biology: Studying microscopic organisms, Meteorology: Simulating cloud formation, I used a prism to catch a beam of sunlight coming through a window. I noticed that the single beam of white light split into a vibrant rainbow of colors on the wall behind it., Meteorology: Studying weather patterns, Physics: Exploring the properties of light, Chemistry: Analyzing color dyes, Astronomy: Measuring the distance to the sun, I placed one piece of bread in a warm, dark cupboard and another piece in a bright, cold refrigerator. I checked them every day to see which one would grow mold first to understand what conditions fungi prefer., Chemistry: Testing food preservatives, Biology: Investigating environmental effects on life, Physics: Measuring the speed of decay, Geology: Studying organic decomposition, I took a group of volunteers and gave half of them a new vitamin pill and the other half a pill that looked the same but contained only sugar. I tracked their energy levels for a month without telling them which pill they received., Social Science: Observing group behavior, Medicine/Health: Testing a placebo effect, Chemistry: Analyzing vitamin composition, Physics: Measuring human energy, I filled two identical glasses with water. I left one open to the air and covered the other with plastic wrap. After three days, I measured the water level in both to see how much had "disappeared" into the air., Biology: Studying water consumption, Physical Science: Observing evaporation, Oceanography: Measuring tide levels, Chemistry: Testing water purity, I rubbed a plastic rod with a piece of silk and then held it near some tiny scraps of paper. The paper bits jumped up and stuck to the rod even though I didn't touch them., Physics: Demonstrating static electricity, Chemistry: Observing a magnetic bond, Biology: Testing paper fibers, Meteorology: Simulating a lightning strike, I placed a magnet near several different objects, including a penny, a paperclip, a piece of wood, and a nail. I recorded which objects were pulled toward the magnet and which were not., Geology: Identifying rock minerals, Chemistry: Testing for chemical reactions, Physics: Testing magnetic properties of matter, Engineering: Building an electromagnet, I looked through a telescope at the night sky over several weeks. I recorded the position of a bright "star" and noticed it was moving against the background of other stars, leading me to conclude it was a planet., Meteorology: Tracking high-altitude clouds, Astronomy: Observing celestial motion, Physics: Measuring the speed of light, Aviation: Identifying distant aircraft, I took a sample of pond water and placed a single drop on a glass slide. Looking through the lens, I was amazed to see tiny, single-celled organisms swimming around that were invisible to my naked eye., Chemistry: Testing for water toxins, Physics: Studying liquid density, Biology: Using a microscope to find life, Geology: Analyzing sediment in water, I struck a metal tuning fork against the table and then held it near a bowl of water. I observed the ripples in the water and listened to the steady humming sound produced by the vibrating metal., Physics: Investigating sound waves, Biology: Testing animal hearing, Chemistry: Testing metal purity, Meteorology: Simulating thunder

Scientific Experiments: Inference & Fields

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