Everyone at some point wishes she could talk with her "future self" and have some insight into how it's all going to turn out. Unfortunately—unless you count Miss Cleo's tele-clairvoyent services—technology hasn't given us a portal to the future yet. But it has improved upon the time capsule.

Grace LeClair had just finished eating dinner with friends when she got the phone call every parent dreads. The chaplain at the Medical College of Virginia was on the other end. "Your daughter has been in a serious accident. You should come to Richmond right away." LeClair was in Virginia Beach at the time, a two-hour drive from 20-year-old Bess-Lyn, who was now lying in a coma in a Richmond hospital bed.

The friend who was with Bess-Lyn has since filled in the details of that day in March. The two women were bicycling down a steep hill, headed toward a busy intersection, when Bess-Lyn yelled that her brakes weren't working and she couldn't slow down. Her friend screamed for her to turn into an alley just before the intersection. But Bess-Lyn didn't turn sharply enough and crashed, headfirst, into a concrete wall. She wasn't wearing a helmet. By the time the ambulance reached the hospital, Bess-Lyn was officially counted among the 1.5 million Americans who will suffer a traumatic brain injury (TBI) this year.

If solar power and recycled building materials just aren´t green enough for you, the brains behind the Fab Tree Hab might have the perfect pad. Architects Mitchell Joachim and Javier Arbona, along with environmental engineer Lara Greden, have designed a house that will grow from a few seedlings into a two-story, water-recycling, energy-efficient abode. The Fab Tree Hab,
a mix of ancient and ultramodern technology, isn´t
merely environmentally friendly.

Forgot your wallet? You´ll need a better excuse than that for passing on the check. By next year, you´ll be able to pay simply by swiping your cellphone a few inches from a cash register, with a new wireless standard called Near Field Communication. An NFC chip in your phone will send your credit-card number-stored on your phone or on the chip-by way of short-distance radio waves. An electronic reader at the checkout will decode the number and ring up your purchase.

Although doctors may someday heal weakened body parts by infusing them with stem cells that develop into specialized tissues, coaxing the body´s own cells to become self-repairing would be an even bigger biological coup. What if we could simply prompt damaged organs to repair themselves?

Blinding rain. Careening traffic. Distracted drivers. There are lots of reasons why car crashes are America's leading cause of accidental death. And one way that most accidents could be prevented: with cars that predict a coming collision-and take action to stop it.

Launch the slideshow to see how titanium oxide reacts with light to zap dirt at the molecular level

Not so long ago, chemical engineers discovered how to use titanium dioxide to keep buildings free of discoloring pollution.

While roller-skating technology has been successfully spiced up over the years (see Rollerblades and those funky off-road skates with the big wheels), this gem from PopSci´s September 1939 issue illustrates an innovation that didn´t quite catch on. A night at the rink may indeed have been hard on the lower back, even before roller-disco. But this third-skate seat extension (hockey stick not included) probably sent more people to the chiropractor than the â€Jungle Boogie.â€

Brain chips that enable us to control machines with our thoughts. Kidneys and lungs built to order in the lab. Pills to make you smarter and more creative. An implant that gives you a tan and protects against skin cancer. All these innovations are in development; some are already being tested on human subjects.

The next technological frontier will be our own bodies. Genetics, materials science, tissue engineering and nanotechnology are already yielding products to help the sick and injured, including a Band-Aid-like heart patch and the C-leg prosthesis for amputees.

Brain chips that enable us to control machines with our thoughts. Kidneys and lungs built to order in the lab. Pills to make you smarter and more creative. An implant that gives you a tan and protects against skin cancer. All these innovations are in development; some are already being tested on human subjects.

The next technological frontier will be our own bodies. Genetics, materials science, tissue engineering and nanotechnology are already yielding products to help the sick and injured, including a Band-Aid-like heart patch and the C-leg prosthesis for amputees.