Sleep usually happens at night. For our ancestors, there were very practical reasons for this. Artificial light was expensive, high maintenance, and not without danger. Also, it was too dim for most kinds of work. Then Thomas Edison made electrical light affordable for daily use – and it was possible to work all night too. …
‘Let’s kill the moonlight!’ proclaimed the Italian poet Filippo Marinetti a few years after Edison’s incadescent lamp enchanted the world. With all our light pollution, we have been quite successful in doing this. And today, some people believe they can create an artificial moonlight. The light of a 4000 Kelvin LED street lamp, so some …
In today’s world, LED displays are omnipresent. We use them for computers, smart phones, e-book readers and television. And we use all these appliances until late at night, often right before we go to bed. After all, we usually have more work than we can cope with in an eight hour day, and reading a …
So there has been another climate conference, where the powerful have discussed how to save our world. Main topic, was usual, is the CO2-production. Let’s be honest, most countries find it challenging to reduce their CO2-output, some flatly refuse to try. But some years ago, a light appeared at the end of the tunnel of …