fil-ter

While “traditional” (if there is such a thing) wireless power systems are specifically designed with a transmitter and receiver in mind, Nokia’s system isn’t finicky about where it gets its wireless waves. TV, radio, other mobile phone systems — all of this stuff just bounces around the air and most of it is wasted, absorbed into the environment or scattered into the ether. Nokia picks up all the bits and pieces of these waves and uses the collected electromagnetic energy to create electrical current, then uses that to recharge the phone’s battery. A huge range of frequencies can be utilized by the system (there’s no other way, really, as the energy in any given wave is infinitesimal). It’s the same idea that Tesla was exploring 100 years ago, just on a tiny scale.

Mind you, harvesting ambient electromagnetic energy is never going to offer enough electricity to power your whole house or office, but it just might be enough to keep a cell phone alive and kicking. Currently Nokia is able to harvest all of 5 milliwatts from the air; the goal is to increase that to 20 milliwatts in the short term and 50 milliwatts down the line. That wouldn’t be enough to keep the phone alive during an active call, but would be enough to slowly recharge the cell phone battery while it’s in standby mode, theoretically offering infinite power — provided you’re not stuck deep underground where radio waves can’t penetrate.

he Amish, particular the Old Order Amish — the stereotypical Amish depicted on calendars – really are slow to adopt new things. In contemporary society our default is set to say “yes” to new things, and in Old Order Amish societies the default is set to “no.” When new things come around, the Amish automatically start by refusing them. Thus many Old Order Amish have never said yes to automobiles, a policy established when automobiles were new. Instead, they travel around in a buggy hauled by a horse. Some orders require the buggy to be an open carriage (so riders – teenagers, say – are not tempted with a private place to fool around); others will permit closed carriages. Some orders allow tractors on the farm, if the tractors have steel wheels; that way a tractor can’t be “cheated” to drive on the road like a car. Some groups allow farmers to power their combine or threshers with diesel engines, if the engine only drives the threshers but is not self-propelled, so the whole smoking, noisy contraption is pulled by horses. Some sects allow cars, if they are painted entirely black (no chrome) to ease the temptation to upgrade to the latest model.

(via waxy)

A nerdy talk about following your dreams. (via HN)