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920Ice in bird bath photo challenge mass, states of matter, critical thinking, observation, density, physical-chemical change, water
466 photo challenge atmosphere, sun, observation, refraction, density, light, waves
919Bowl of water on scale photo challenge mass, critical thinking, density, gravity, measurement, investigations and experiments
442 photo challenge atoms, critical thinking, plant parts, information processing, misconceptions, nuclear, plants, measurement, energy
Microscopes: Making a Wet Mount video, learnalong, checked observation, refraction, reflection, light, microscope
Minerals: Fracture video, learnalong, checked properties, structure and function, classification, minerals, measurement, crystals
Microscopes: Making a Dry Mount video, learnalong, checked observation, refraction, light, microscope
Introduction to Microscopes video, learnalong, checked refraction, light, microscope
Identifying Minerals video, learnalong properties, information processing, classification, minerals, element, measurement, rocks, compound
Microscopes: Growing Crystals video, free, learnalong, Updated refraction, light, microscope, waves, classification, crystals
Laser Projection Microscope video, learnalong, checked refraction, reflection, engineering, light, microscope, waves
Minerals: Hardness video, learnalong, checked properties, classification, minerals, measurement
Minerals: Streak video, learnalong, checked observation, reflection, light, classification, minerals, measurement
Growing Crystals Under the Microscope video, free, learnalong, checked refraction, light, microscope, waves, classification
Minerals: Luster video, learnalong, checked observation, properties, reflection, light, classification, minerals
Yellowing Paper text page, free, checked electromagnetic spectrum, science fair, Variables and controls, critical thinking, observation, light, investigations and experiments, physical-chemical change, energy
Sunglass Science: Polarized Light video, free, Updated refraction, properties, light, waves, energy
What is a Higgs boson, and why should I care? text page, blog, free, checked mass, atoms, critical thinking, model, information processing, misconceptions, hypothesis, theory, and law, matter
Dew on the Window text page, free states of matter, thermal energy, water
Dirty Words of Science text page, blog, free critical thinking, information processing, pressure, misconceptions, force and interactions
Whistle Stick video, text page, blog, free, checked motion, engineering, structure and function, sound, waves, force and interactions
Mirage video, free, ClosedCaptions, Updated critical thinking, refraction, weather, density, light, structure and function, waves
Eclipse Watching text page, free electromagnetic spectrum, senses, sun, light, moon, solar system, safety, waves
Electricity video, free, Updated static electricity, electricity, attract/repel, energy
Making a Screamer video, free, Updated Halloween, Holiday, cycles, motion, engineering, pressure, structure and function, sound, force and interactions, energy
Sorting Salt and Pepper, How Many Ways? text page, free mass, solution, static electricity, Variables and controls, critical thinking, observation, motion, properties, density, engineering, friction, electricity, structure and function, attract/repel, investigations and experiments, mixture, force and interactions
331 photo challenge, free static electricity, critical thinking, weather, engineering, electricity, structure and function, misconceptions, safety
Experimenting with Dry Ice video, free, checked Halloween, states of matter, thermal energy, physical-chemical change, matter
Calories: Measuring the Energy text page, free digestive system, misconceptions, human body, measurement, anatomy, energy

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