Wiki World: light

Showing posts with label light. Show all posts

If you move as fast as superman you may be able to make yourself invisible, but for the ordinary person it is just not possible. Theories exist though that "prove" it is possible to make yourself invisible. Doctor Jensen Li and Professor John Pendry have written a paper which surmises making invisible paint.

Such material has to be extremely thin, having a structure smaller than the wavelength of visible light. Scientists have already made a small object invisible by cloaking it in a material comprised of tiny structures. If a material can be developed from nano-sized pieces it could be painted on an object and it would "bend" the light away from sight, i.e., the background would be visible.

Such a material has to be made from silica and silicon because variation in interpreting light is necessary. A person viewing a cloaked object would see a mirage of the background. Don't be too hasty though - we are not in the Star Trek world yet. A person would experience only an illusion of the background!

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Science

Cats in a Tough World

"It's a tough world out there."

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Funny Animal Photos

Cat Punches Dog

"Take that Biffo"

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Man Robs Store With a Florescent Light Tube

Can't get gun or a knife but you want to hold up a store? Don't worry you can always use a light bulb. A man walked into a Brisbane service station and threatened the till operator with a florescent light bulb. He got away with a sum of cash.

The Caucasian man, about 180cm tall with a chubby build and blue eyes was wearing a singlet with white stripes down the sides, shorts, white sports shoes and a dark balaclava at the time of the robbery.

It begs the question - Why would an employee be afraid of someone wielding a florescent light bulb, knowing that a descent "whack" would probably result in it being smashed into harmless pieces?

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Society

No Night Darkness in the Infrared

Human beings perceive objects by seeing in the "normal" optical range. This is purely an evolutionary imperative. Evolution could just as easily given us eyes that work in the infrared to know what is going on around us. If this was the case we would experience no night at all. The night sky would be just as clear as the sky in the day.

At night the sky would be lit by hydroxyl molecules emitting infrared light in the form of a mass of narrow emission lines. It would be like daylight, though a few stars could be seen along with the Sun and the Moon.

Telescopes operating in the infrared get over this problem by using limited apertures and special filters. These filters use a photonic lantern system to move the light into parallel tracks. A Bragg filter reflects out the tracks and lets wavelengths between lines through. Many IR telescopes are in space where such a filter is unnecessary. The space telescopes beam data back to Earth.

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Science

Beer Dog

"I'll have one more for the road."

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Funny Animal Photos

Afternoon Sun

Catchin' the Afternoon Sun

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Funny Animal Photos

Labels: carpet , cat , chair , dog , door , floor , four , light , room , sun

Cat Light

"I can shine light from somewhere else it you like."

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Funny Animal Photos

Labels: air , cat , dance , fun , jump , light , room , shine , show , two

Chandelier Cat

"You should stop throwing us animals around, Fatso!"

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~~~~~Funny Animal Photos~~~~~

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Cat Light

"Let me light up your life."

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~~~~~Funny Animal Photos~~~~~

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Lion Doctor Operation

"Don't worry. The operation will be over in a jiff."

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Bull Ants Feed at Twilight

Bull ants do not feed during all daylight hours. Observation has shown that they feed at twilight. When the sun is brighter for longer, for example in summer or there is no cloud cover, they forage for food later in the day. When the sun is darker, earlier, they search for food sooner in the day. It was believed that all insects fed according to circadian rhythms, but this does not seem to be the case.

Activity in the nest was affected by cloud cover. But outside activity that involves feeding occurs at twilight. Obviously, they are feeding during these short intervals to avoid predators. Most animals that eat ants would be inactive at twilight.

Tests were done at ANU in Canberra. Bull ants were put in containers where diffused light was altered. It was found they only fed when the light was set at a particularly low level. Evolution does take some winding paths. This shows though that evolution develops in a rational way.

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