He came into the room looking dejected and down. I asked him why and he told me that he just came in from #Kaduna which is just #2 hours from #Kano.
Upon further enquiry he disclosed to me that he suffers from #MOTION_SICKNESS

THEN THE QUESTION CAME TO ME ABOUT WHAT IS "MOTION SICKNESS."

Motion sickness is a condition in which a disagreement exists between visually perceived movement and the vestibular system's sense of movement.

TYPES OF MOTION SICKNESS

Motion sickness can be divided into three categories:

1. Motion sickness caused by motion that is felt but not seen
2. Motion sickness caused by motion that is seen but not felt
3. Motion sickness caused when both systems detect motion but they do not correspond.

MOTION IS FELT BUT NOT SEEN:
In these cases, motion is sensed by the
vestibular system and hence the motion is felt, but no motion or little motion is detected by the visual system. #Example is car sickness etc

MOTION THAT IS SEEN BUT NOT FELT:
In these cases, motion is detected by the visual system and hence the motion is seen, but no motion or little motion is sensed by the vestibular system . Motion sickness arising from such situations has been referred to as "visually induced motion. A good example is Films and other video

MOTIONS THAT ARE SEEN AND FELT BUT DO NOT CORRESPOND:
When moving within a rotating reference frame such as in a centrifuge or environment where gravity is simulated with centrifugal force, the
coriolis effect causes a sense of motion in the vestibular system that does not match the motion that is seen.
Sometimes when riding a vehicle for a long time on a badly maintained road at a very slow (10–20 km/h) speed the two senses fail to correspond. Due to the poor road quality the vehicle will jerk too much giving a sense of severe motion to the inner ear, but due to the slow speed, the eye doesn't sense a proportional amount of motion.

WHAT ARE THE SYMPTOMS?

Motion sickness can cause:
A general feeling that you're ill.
Nausea,
Vomiting,
Headache,
Sweating.
Symptoms will usually go away soon after the motion stops.

WHAT CAUSES MOTION SICKNESS?

You get motion sickness when one part of your balance-sensing system (your
inner ear , eyes , and sensory nerves) senses that your body is moving, but the other parts don't. For example, if you are in the cabin of a moving ship, your inner ear may sense the motion of waves, but your eyes don't see any movement. This conflict between the senses causes motion sickness.
You may feel sick from the motion of cars, airplanes, trains, amusement park rides, or boats or ships. You could also get sick from video games, flight simulators, or looking through a microscope. In these cases, your eyes see motion, but your body doesn't sense it.