Man in space
On Friday 13 January Professor Carl Johan Sundberg from the department of physiology and pharmacology at Karolinska Institute visited IEST. He held an informational but interesting lecture on the physical effects on the human body by being in space. At the end of the assembly he answered some questions that the students asked.
One thing he talked about was how the body reacted to having no gravity act upon it. He mentioned that the muscles don’t need to work as much in space, since they don’t need to hold up the body in such a way as on Earth. He explained that the unused muscles start to lose mass, and therefore the astronauts get weaker. There are ways of exercising in space, but they are far less effective than on Earth. The amount of muscles you lose when you are in space for four to six weeks is roughly the same muscle mass you would lose when lying in bed for the same amount of time.
Dr Sundberg also mentioned that when you are in space you lose red blood cells because the muscles do not need the same amount of oxygen because they are not being used as much, so the body doesn’t need to carry as much oxygen around the body. This loss of red blood cells could increase the risk of fainting, among other things.
He spoke shortly about the mental effects of being in space, and they were mostly due to being with the same people in a small space for a long time and having tight schedules with little sleep.
In the end he got some interesting questions from both students and teachers. One of the many question he got was if the astronauts had to drink their own urine, and he explained that they only needed to drink the water extracted from it.
(Story written by IEST student, Alexander Lundquist 8B)
Physicists from Stockholm University
On Wednesday 18th January, visitors from Stockholm University brought some wow moments to IES Täby with some live demonstrations in physics and insights into the real and wonderful workings of nature. Students wrestled in vain against atmospheric pressure to try pull apart Magdeburg hemispheres; they saw a light bulb turn on without being connected to any source of electricity when held close enough to a Tesla coil; they peered into the invisible world of the Electromagnetic spectrum and saw themselves in infrared; they saw sound waves transmitted by a laser as well as the sound waves of music in flames above a Rubens’ tube; and they ate biscuits that had been cooled down to -196 ℃ in liquid nitrogen.Our thanks go to our the science team from Stockholm University.