The Best Computer Under $500

Here is some helpful information to find the best computer under $500. The average price of a personal computer is somewhere in the neighborhood of $1300, according to CNET.com. That’s a rather hefty chunk of change, especially if you’re a recent high school or college graduate and don’t have a sizable bank account (who does in this economy?). Even spending …

New Record: World’s Largest Wind Turbine (7+ Megawatts)

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The world’s largest wind turbine is now the Enercon E-126. This turbine has a rotor diameter of 126 meters (413 feet). The E-126 is a more sophisticated version of the E-112, formerly the world’s largest wind turbine and rated at 6 megawatts. This new turbine is officially rated at 6 megawatts too, but will most likely produce 7+ megawatts (or …

LED Grow Lights

A lot of readers expressed interest in using red and blue LEDs for hydroponic growing. These LED lights can be found at Amazon. It is, of course, more efficient to grow plants outside, but when this is not possible, LEDs are an efficient choice.

Electric Tankless Water Heaters

Note: This post has been expanded and updated for 2009! Tankless water heaters only heat water when it is needed. About 8% to 30% of the energy consumed by a standard water heater goes to keeping the water hot while it’s not being used. New tankless systems heat the water instantly when you turn on the faucet, rather than keeping …

Skyscraper Creates All Its Own Energy

This skyscraper, to be built in Dubai, is called the Burj al-Taqa (‘Energy Tower’), and it will produce 100% of its own power. The tower will have a huge (197 foot diameter) wind turbine on its roof, and arrays of solar cells that will total 161,459 square feet in size. Additional energy is provided by an island of solar panels, …

The Best LED Flashlights Of 2014

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In A Nutshell Update: We have more newer article over here — The Best LED Flashlights Of 2015 Here are the best LED flashlights of 2014: The brightest keyring-size LED flashlight: Fenix LD01 — 80 lumens — costs around $40 The best standard-size LED flashlight: Fenix TK11 R5 — 225 lumens – costs around $75 The brightest LED flashlight that …

Chinese Design Winner: High-Rise With Vertical Hydroponics

This apartment high-rise concept won a sustainable housing award recently in China. It integrates a vertical greenhouse into the high-rise. Designed by Knafo Klimor Architects, the “agro-housing” concept allows the residents to produce their own food, reducing commuting needs and providing a green neighbourhood. The greenhouse is a multi-floor structure for cultivation of crops such as vegetables, fruits, flowers and …

The Best Rechargeable Batteries and Chargers Of 2015

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In A Nutshell Here are my recommendations for the best rechargeable AA batteries: If you want the best energy capacity (2500 mAh) — get the Eneloop Pro If you want maximum recharge capacity (2100 times) — get the 4th Generation Panasonic Eneloops (800 mAh) If you want to save some money and don’t mind a little less performance from your …