Fortifications are militaryconstructions designed for defensivewarfare. They have been used for many thousands of years, in a variety of increasingly complex designs. The practice of improving an area's defense is also known as "fortification". Many military installations are known as forts, although they are not always "fortified".
... will not simply fall over, but start precessing around. (The precessing motion is perpendicular to the torque trying to make the gyro fall over.)
The axis of the ...