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Submarines submerge and surface by changing the average density of the hull.
Can we break a stick with the weight of only a few sheets of paper?
Direct action pumps and suction pumps are among the simplest water pumps.
A spacecraft on its path is in a constant state of free fall.
In certain cases, liquids do not mix together, and form layers instead. See what happens when we...
The three important laws describing planetary motion were formulated by Johannes Kepler.
Can a candle be re-lit if the flame of the match does not even touch it?
How can this pendulum accurately measure time in seconds?