Archive for the 'Sciences' category

Even knowing that those are machines created to kill people, you will not be able to keep yourself from laughing or smiling at some of absurdly extreme designs generated by the brains of some military engineers.

Source: Dark Roasted Blend.

All the details about a simple optical illusion and what we can learn from it about the inner workings of the human brain.

Usually, robots you see in real life are hardly able to move around or to behave… like a robot. This one is all the more impressive. It moves, it walks, it runs on four legs adapting itself to nearly any kind of rough terrain as well as a mule, a dog, or a man (on all fours, I told you!).

BigDog from Boston Dynamics is all that, it has been paid by the US Army Pentagon (through DARPA) and despite its name (Big Dog) it makes me irresistibly think about a big fly (nice buzzing quadruped) or an AT-AT robot out of the Star Wars movies.

Thanks Roland for showing me this weird electronic animal.

A scientific study coming from Iceland suggest that in the recent years the minke whale population suddenly dropped from 45000 in 2001 to less than 15000 last year. This is a enormous change that is not yet explained for a small whale that was more or less protected by its smaller size (big whales bring bigger profits).

Source: Science Blogs.

Several times, I talked about the limitation to photo image quality by light diffraction but I failed to go into the details. To the general request of one reader who asked, I will try to give some explanations to better understand why the digital photographer must absolutely take that into account to make better pictures and to choose its camera.

The first thing to know is that light diffraction is a very general phenomenon and quite natural. It’s been a long time already that scientists and engineers noticed that -on the one hand- light rays are slightly deflected while running through a very small orifice and -on the other hand- two light rays can interact with each other on the condition that they are have very paths nearly perfectly parallel. This is even one of the most significant and founding elements of quantum physics. When you combine both those phenomenons, you will notice that light going through a very small opening like camera lens diaphragm will produce not exactly the expected neat circle but a more irregular and circular shape that you can see in the illustrative figure that goes along this paragraph: Usually named an Airy disk or Airy disc.

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V838 Monoceroti Expansion (Hubble)

It wasn’t anything interesting until it happened but the star V838 Monoceroti, which had simply sat in obscurity, flared up in 2002 to become 600,000 more luminous than our own Sun. It didn’t take long for the star to fade back into the darkness but the Hubble Space Telescope managed to get quite a few pictures of it during its active phase.

In this series of images you can see how the star’s outer layers were first expelled and then cut away by the powerful radiation from the star. The event was made even more interesting by the fact that a “light echo” was seen. During the expansion the object appeared to expand faster than the speed of light - the effect was however merely an astronomical optical illusion.

Other strange things in space

The 10 Strangest (Real) Things in Space (at Orbiting Frog).

This is the question or the hope that we can have after the opening of a legal investigation in Japan. A public prosecutor announced on last 19th of May that he decided to explore the observed operations of sale of whale meat to restaurants.

Greenpeace actively participates and there are many people hoping this to be the first step toward a true prohibition of Japanese whaling (even for “scientific” reasons).

Source: NewScientist.

Feline teeth are their most prominent exterior feature. Since the prehistoric Smilodon (the smiling feline) and its gigantic canines, big cats use their impressive dental characteristics to hunt.

On the Laelaps web site, you will find a detaileld article on feline teeth, from yesterday to nowadays: What big teeth you have. Please, also notice the hunting videos (lions hunting elephant, lions hunting a giraffe).

Great Britain does not look like the place to look for big cats, but there are some large felines clearly not indigenous roaming freely in the United Kingdom. It is such a big thing that there is an investigative group collecting evidence about them: panthers, lions, cheetahs in the cold weather of England or Scotland.

Big cats in Britain

Yesterday, we were speaking here about prehistoric big cats in places where they disappeared (e.g. Europe). Today, I want to point at a surprising proposal made by Josh Donlan.

Recognizing that many big cats were roaming in North America tens of thousands of years ago, he want to re-introduce lions, cheetahs, elephants and other large animals in North America. He admits that this could be a bit difficult and that there is no way to rebuild the original population. But he offers ideas about how to bring camels and lions (from the closest relatives species) to a country were they were last seen hundreds of centuries ago.

Of course, it sounds a lot like Jurassic Park for real. Are you ready to find in the United States cheetahs hunting pronghorn bucks in the Wild West (wild again) or in Montana?