Comment Allergies are Auto-Immune Disorders (Score 1) 243
Medical "science" is finally approaching what ought to have been obvious; that the "epidemic" of asthma and allergies are most likely our own doing. Our homes are TOO CLEAN for children!
Babies have fairly primitive immune systems; like every other part of a baby, it needs to be trained. When babies crawl in the dirt and get exposed to "nature", their immune systems come to recognize what's normal. At some age - about a year or so - their immune systems begin to react to "new" things in the environment, and begin to fight them. So dust or pollen become a problem, especially if mommy has been keeping the house spotless and immaculately clean. Never rolled around on the floor with a dog? Never ever eaten peanut butter? By age 4, you're going to be deathly allergic to them.
Mothers; take your babies out into the yard! Let them crawl in the grass, like us old folks did when WE were babies. They need the vitamin D to prevent rickets, and they need exposure to earth so that they don't develop allergies to the Earth.
Science fiction writer L. Neal Smith has suggested that our descendants born on orbital habitats may never be able to come to Earth; they'll be allergic to it. It may be a matter of shipping a few tons of dirt and dust up to spread in the air filters, just to ensure that our grandchildren can come visit!