Normal dizziness can be caused by rotating while upright (e.g spinning by turning rapidly while standing up or sitting on a spinning roundabout in a playground). The effect when the spinning is stopped is that the world around you seems to keep spinning horizontally relative to your body and the body tries to compensate causing funny uncontrolled movements (also, if you lie down the apparent spinning still continues horizontally relative to your body). Can the axis of the apparent spin be changed?

If you lie down on your back on a spinning roundabout facing up, will the world seem to spin in a circle in front of you? or If you lie on your side on a spinning roundabout facing forwards, will the world seem to move vertically in front of you? If so, What would your body do to compensate?

Or can the apparent movement only occur horizontally?

Whenever I consume the smallest amount of a foodstuff containing lactose, i become disoriented, dizzy, have difficulty thinking clearly. This usually lasts for several days. A blood test has confirmed that i have problems with cows milk, but the associated stomach trouble is at least understandable. I thought that the blood/brain barrier would not permit anything harmful to cross?

Year 5, Christopher Hatton School, London, UK

When I was a kid, I remember thinking that adults were rather boring for not enjoying the feeling of dizziness like I did, and I vowed to always enjoy it. Now, as an adult, I can't stand it - it makes me want to throw up. It seems many other adults feel the same way. Why is this? Does something change in us as we age?

Ivan V., Mexico City, Mexico