Packing for Mars

Animal protein and fat have the highest digestibility of any foods on Earth. The better the cut, the more thoroughly the meat is digested and absorbed—to the point where there’s almost nothing to egest (opposite of ingest). “For high-quality beef, pork, chicken, or fish, digestibility is about ninety percent,” says George Fahey, professor of animal and nutritional sciences at the University of Illinois at Urbana-Champaign.

Being a Mercury astronaut must have been like being trapped in the sauces aisle of a very small grocery store.

Contractions play an important role in a newborn’s adjustment to life outside the womb. The compressions of vaginal birth cause a huge release of stress hormones in the fetus; these are the same fight-or-flight hormones that fuel feats of extreme strength in adults. “This hormonal surge appears to be very important for getting physiological systems moving. All of a sudden a newborn has to breathe on its own, it has to figure out how to suckle from a nipple. If there aren’t enough contractions, the hormone release is smaller and the fetus has a harder time.” Studies have shown that infants born via planned C-section, with no contractions—as compared to those delivered vaginally—have a higher risk of respiratory distress and high blood pressure, a harder time expelling lung fluids, and delayed neurodevelopment. In other words, stressing an infant appears to be part of nature’s plan. (For this reason, Ronca is also not an advocate of water births.)