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Astronomers measure distances to the stars in terms of light years, units that combine time and distance. One light year is the distance light travels in one year; so if you look at a star... read more
[embed]https://www.youtube.com/watch?v=OM6iC6N12xY[/embed] Did you know that you can cause a packet of ketchup to rise and fall on command in a bottle of water? People might even think that you have... read more
...Written by Steve Spangler Experiment Materials Milk (whole or 2%) Dinner plate Food colouring (red, yellow, green, blue) Dish-washing soap (Dawn brand works well) Cotton swabs Click... read more
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