The answer was 8
Facebook Data Science calculates just how connected the world really is.
Still no word about the xenomorphs, though
The remarkable physics of a powerful vault
Arun Majumdar has to decide which researchers will get millions of dollars, and he has to do it fast. He must spark an energy revolution within 20 years, or it's lights out for us all.
Rossi--a lone Italian inventor with no real credentials and a history as a convicted scam artist--has convinced a small army of researchers that his box can harness a new type of nuclear reaction. What if they're right?
Cars and devices could soon be powered by hydrogen extracted from urine
Louis Michaud has received funding from Peter Thiel's Breakout Labs to harness energy through manmade vortexes. Will your streetlights soon be powered by a tornado?
On the bright side, that's sooner than others suggest
A 21st century electric-car revival is under way. But the first challenge—building a cheap, safe, powerful battery—is the hardest
Wind, solar, tidal—all are battling for the renewable-energy crown, but what about the six billion highly efficient short-stroke engines in our midst? What about us?
A mobile bioreactor turns trash into electricity for U.S. troops
As nations around the world rush to reconsider their nuclear plans, nuclear experts look toward a future of smaller, safer reactors designed to greatly reduce the likelihood of a Fukushima-sized catastrophe
Arsenic and old manuscripts.
Supplying energy to homes using only the motion of the ocean
Dangerous fumes from an African lake could be the fuel of tomorrow
It's all about enrichment
This concept skyscraper could generate enough energy to power 4,000 homes
Lawmakers look to new nuke plants to fuel the coming hydrogen economy.
A new energy method could trigger a risky side effect
Combining energy from multiple ambient sources generates a more stable supply for sensors
Recycling: It's not waste unless you waste it.
Subtle movements create current
Turbines to take root in the sea
A groundbreaking new device has given an artificial heart recipient new freedom, replacing the 400-pound machine that kept him tethered to the hospital
Living neurons are coming up with better solutions for electricity distribution than people can.
Addressing the American Geophysical Union, James Hansen urges fellow scientists to study, share facts on nuclear energy
Pedaling consistently churned out about 150 watts.
Shining in the desert
The maiden voyage of an unusual ship suggests promise for alternatives to fuel
Can cell phones pop popcorn? Just watch
The string of atolls has switched fully from expensive and environmentally harmful diesel generators to solar energy.
Visions of a sweet future
The evidence lies in a Chaco Canyon crypt
We're heading in the wrong direction.
The craft touched down in New York over the weekend after zipping across the States, but not without some technical difficulties.
Read the full issue online now
Our editors scrounged up some truly bizarre facts.
Could sudden climate change wreak independence day-level havoc? The director of The Day After Tomorrow let us run his new disaster flick by the experts. Uh-oh.
Instead of flying out of Dallas and touching down in a reserved hangar, the sun-powered plane Solar Impulse will land in an inflatable structure for part three of its trans-America flight.
Could sudden climate change wreak Independence Day-level havoc? The director of The Day After Tomorrow (out May 28) let us run his new disaster flick by the experts. Uh-oh.
New ways to keep time, count bees, and spot energy leaks in your home
Choo-choos and plant-based fuels are in our energy future.
Bonsai-scale energy lesson
A new device that amplifies waves and captures their energy could soon power parts of Rhode Island
Innovations and steep gas prices may at last kick-start wind energy in the U.S.
An innovative plan to bring high-speed Internet through electrical outlets may not see the light of day
What's cleaner than clean coal, but also, well, filthy? Bring on the BioGas (and one cool comic)
New nanogenerator technology could lead to clothes that power your gadgets
Wind, solar, tidal-- all are battling for the renewable energy crown. But what about the six billion highly efficient short-stroke engines in our midst? What about us?
A shock absorber that generates energy and increases fuel efficiency
No plans currently for Wigsphere conversion
Metal plates under a supermarket's parking lot harness the power of passing cars
A company plans to construct the world's largest solar power project ever, in the Sahara
A new bike-sharing program stores the kinetic energy from the bikes to power buses, and gives cyclists a free bus ticket for helping out
Harnessing the terawatts of energy we get from the sun
The groundbreaking plant produces about enough power to make a pot of delicious coffee
New technology produces energy from fuel without burning it
Engineers harness sound to simplify microfluidic devices (watch the music video!)
Google, eBay, FedEx have already started using Bloom Boxes
A bureaucracy built for oil and gas leasing punishes the most efficient technology