
Sonic Showers
Though much has changed since humankind fled the wilderness for civilized comforts, one thing hasn't: We still clean ourselves with water. Yet traditional showers take time, waste resources and don't necessarily get the job done. Instead, we should take a lesson from doctors who sterilize surgical instruments through techniques such as high-pressure, high-temperature autoclaves, ethylene oxide gas and ultrasonic vibrations. While these methods aren't exactly "people-friendly," a little research may enable modern humans to step out from under the indoor waterfall and give up the last of our caveman-like ways.

Life Simulator
The world is complicated, and big decisions can be hard to make. Instead of trusting your own fallible human intuition, why not plug the variables of your life into a supercomputer and watch your fate unfold by the numbers? Advanced simulation software could generate a slew of parallel lives, each following a different fork in the road: where you live, which person you date or whether you adopt that Great Dane puppy. The U.S. Army already uses tactical simulators to predict the outcome of battles and to fine-tune supply-chain logistics. Now, researchers at the Institute for Creative Technologies at the University of Southern California are working on the Intelligent Forces project, with the goal of simulating the behavior of civilian populations -- and insurgent forces -- on a citywide scale. If the combat shifts from Baghdad to Darfur, researchers can even plug in different cultures. Predicting the outcomes that stem from whether you ask for that raise, buy that house or quit your job for a career in animal husbandry should be easy in comparison. In the coming decades, this type of technology could be used by urban planners, video-game designers and maybe even indecisive civilians who face tough life decisions.

Legged-Robot Everything
Humans invented the wheel; Mother Nature invented legs. It was only a matter of time before we realized her design was better. The product of this epiphany? A wheelchair that can walk. Developed by Toyota, the "i-foot" prototype is an 8-ft.-tall bipedal throne that ambles, kneels and climbs stairs on backward-bending, ostrichlike legs. But let's not stop there. Picture a world of legged beds, couches and tables. People could downsize their houses to only two rooms: a storage room that holds the furniture and a main room that shifts to become whichever space is needed. Want a living room? Have the couch and coffee table walk over. Need a beer? Call the refrigerator. Feel free to mix and match: Take a bath while watching television, or cook dinner while using the treadmill. Anything is possible in the legged home of the future!

Insect Force Field
Insects are important for healthy ecosystems, but they also ruin crops, spread disease and occasionally bite your neck -- ouch. Clearly, humankind needs a portable device capable of protecting an area from all six-legged critters. An insect force field would allow hikers to wear what they want, sleep outside the tent and come back for a dropped candy bar an hour later and find it whole. Harmful pesticides and superfluous food packaging would be a thing of the past -- so would Lyme disease and West Nile virus. Sadly, current technology is lacking: Researchers consider ultrasonic pest-control devices useless, and bug zappers -- while fun to watch -- kill the good insects with the bad.

Kid OnStar
Cars have it, so why not kids? In an automobile, GM's OnStar system is a computer that monitors car diagnostics such as engine temperature, tire pressure and whether the airbags have deployed. In the case of an accident, the system uses a built-in mobile phone and GPS tracker to contact a dispatcher who arranges to send help to stranded motorists. Similarly, Kid OnStar could be packaged into a bracelet or necklace crammed with sensors that monitor location, physiological status and voice stress levels. Parents could receive monthly diagnostic checks on exercise levels, notification if children are injured or kidnapped and the assurance that emergency services will be sent the instant a problem arises. While newer versions of OnStar allow police to automatically disable a vehicle at the touch of a button, we don't recommend this feature for Kid OnStar -- no matter how rowdy your offspring may be.