http://ksnn.larc.nasa.gov/webtext.cfm?unit=food

>Astronauts need the same kinds of nutrients that everyone needs on Earth. The same goes
>for calories, vitamins, and minerals. Some exceptions are iron and Vitamin D. Medical
>tests with astronauts have discovered they produce fewer (less) red blood cells while
>they are in space. Iron is needed for new blood cells to form. Other medical tests have
>shown astronauts lose bone material on long-duration space flights. Vitamin D is needed
>for bones to stay healthy. Vitamin D is produced when we are in sunlight. Therefore,
>astronauts on the ISS take Vitamin D supplements.

Very simple sentences with a conclusion: therefore

So what is this a priori or a posteriori

So who on this board can show what energy is required to transform Previtamin D3
into Vitamin D3. Is the photon energy of UV A sufficient?, UV B ? or UV C ?
In space flight, away from an Earths orbit what energy forms are bombarding the entire
spacecraft?

Is it true that the Earth allows us to live within a certain portion of the
electromagnectic spectrum? So what happens when humans go outside of those confines?

Produced by the NASA LaRC Office of Education
Responsible NASA Official: Dr. Robert M. Starr
Grade K-2 Animations - Destiny Images, Inc., Copyright 2004
Questions or Comments? E-mail them to >>>>>dlcenter+mail@larc.nasa.gov<<<<<
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A very simple question was sent to the 'contact us' and this is what was returned
by mail.
Subject:Undeliverable mail
Date:Fri, 21 Dec 2007 01:49:58 -0500
From: Postmaster@issmail.larc.nasa.gov
To: XXXXXXXXX@XXXXXXXXX.XXX
CC: Postmaster@issmail.larc.nasa.gov
Your message was not delivered to the following recipients:
dlcenter+mail@larc.nasa.gov: User unknown

Just the type of @#$%6&&!! hogwash that NASA is really about when you want to ask the right
questions.

Another e-mail was sent here:
s.w.bowers@larc.nasa.gov

I will wait for a reply.

regards,

sunblok