Catch up on stories from the past week (and beyond) at the Slashdot story archive


Forgot your password?

+ - Lighting In A Bottle->

Submitted by Anonymous Coward
An anonymous reader writes "A brilliant idea. The BBC reports, "Alfredo Moser's invention is lighting up the world. In 2002, the Brazilian mechanic had a light-bulb moment and came up with a way of illuminating his house during the day without electricity — using nothing more than plastic bottles filled with water and a tiny bit of bleach. In the last two years his innovation has spread throughout the world. It is expected to be in one million homes by early next year. So how does it work? Simple refraction of sunlight, explains Moser, as he fills an empty two-litre plastic bottle. "Add two capfuls of bleach to protect the water so it doesn't turn green [with algae]. The cleaner the bottle, the better," he adds. ... "An engineer came and measured the light," he says. "It depends on how strong the sun is but it's more or less 40 to 60 watts," he says. ""
Link to Original Source

Comment: Re:May have missed ? (Score 1) 265

by Govno (#37740868) Attached to: Comet May Have Missed Earth By a Few hundred Kilometers
The picture in that article isn't the picture of the original comet-like bits from 1883 as no pictures seem to have been made of the event in 1883. Also, another observation of the comments from below the actual article .. A "flock of birds" flying between the telescope and the sun would most likely be perfectly in focus, at least judging from various internet pictures of airplanes flying between sun and telescope and my own personal observations of seeing both a seagull and a satellite passing in front of the sun while looking through a Lunt solar scope. The edges of both the seagull and the satellite were razor sharp while I was focused on the sun.

Comment: Re:That wasn't smart. (Score 1) 156

by Govno (#35535874) Attached to: The 'Adventure' In Self-Publishing an IT Book
I've purchased books for $0.99 just to check them out. In one case, the author's writing style was crap (imo .. who the heck writes fiction in present-tense?!?) so I won't buy any of his (much higher priced) sequels, but I'm not sweating the dollar it cost to find out I didn't like the author .. and the others I've purchased for .99 were good reads.

Comment: Re:They could wedge something in there! (Score 2, Informative) 560

by Govno (#33142046) Attached to: Denials Aside, Feds Storing Body Scan Images

Oh sure, you say that know, but when the first vagina grenade goes off on a crowded plane, what will you say?

The problem here is body scanners wouldn't detect a vagina bomb in the first place. They only penetrate roughly 1/10th of an inch below the skin. Ironically, the explosives sniffers WOULD detect it but typically aren't being used in areas "protected by" body scanning devices.

Comment: Re:Dang! Things were just getting fun (Score 2, Informative) 756

by Govno (#29025195) Attached to: Earth's Period of Habitability Is Nearly Over
Do *you* know the actual physical volume of "60,000 metric tons" of nuclear waste, offhand?

Plutonium: 19816 kg/m^3
Uranium: density = 19.05 grams per cubic centimetre = 19,050 kg/m^3

60000 tons / 19 tons per cubic meter = ~ 3158 cubic meters, or approximately 1 to 3 olympic swimming pools, depending on depth.

This nuclear waste stuff redefines the meaning of the term "heavy" in heavy waste.

God help those who do not help themselves. -- Wilson Mizner