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Ethicists Tell NASA How To Weigh Hazards Of Space Travel

Astronauts should be small such as 70 lbs. midgets. Smaller and lighter life support and suits save space and food etc. 

Put two on a fast rocket to Mars, land and return. A mini mission. Small is the solution. Alan Shepard was 115 lbs but need micro people. 50 lbs. small will win the space race.” - comment from PBSisBest Org

As a species, humans manifest a quality called neoteny, the retention of juvenile characteristics into adulthood. Neoteny has physical ramifications—scarce body hair and a flat face are two examples—but it also has neurological ones. Namely, we have an extraordinary capacity to continue learning throughout life. If neoteny helps to explain our ability to learn, researchers are now figuring out what drives us to take advantage of it. In 2008, a group of scientists set up a novel fMRI study. When a sub­ject’s curiosity was piqued by a question (“What is the only country in the world that has a bill of rights for cows?” for instance), certain regions of the brain lit up. Those areas, known collectively as the basal ganglia, correspond to the brain’s reward centers—the same ones that govern our desire for sex or chocolate or total domination in Call of Duty 4. When people say they have an itch to figure something out, they’re not speaking metaphorically. They’re looking to get high on information. Curiosity, then, is not some romantic quality. It is an adaptive response. Humans may not be the fastest or strongest creatures, but through the blind luck of evolution, we developed the desire and capacity to continually update our understanding of the world. And that has allowed us to master it—or get darn close. Call it the biological basis for being a nerd.