An ice cube in a glass of water will not raise the water level when it melts. The amount of space it displaces as a cube is equal to the amount it takes up when liquified.
The acceleration which must result from the use of rockets, or from being fired out of a gun by explosion, inevitably would damage the brain beyond repair. The exact rate of acceleration in feet per second that the human brain can survive is not know . It is almost certainly not enough, however, to render flight by rockets possible."
- J.P. Lockhart-Mummery, After Us, 1936.
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