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Stories about: ultrasound |
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The noise of a waterfall can easily cover the croak of a frog and this is why, in most cases, many frogs living near flowing water have quiet croaks and lack vocal sacks. However, a Chinese frog came up with the perfect solution for this tiny predicament: ultrasound croaks! We're talking about the small concave-... |
12 May 2008
02:55 GMT |
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Human ear cannot detect sounds that have frequencies lower than 20 Hz (infrasounds) or over 20 kHz (called ultrasounds). That's why some species may appear quite silent for us, while in fact they are very noisy... We only lack their hearing to figure this out.1.Dolphins and toothed whales are famous for their so... |
20 December 2007
14:06 GMT |
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Humans see with their eyes, dogs are said to "smell" things and bats literally see with their ears. The little flying mammals have a complex sonar, employing ultrasounds (sounds with a frequency over 20 kHz, which cannot be heard by the human ear). Bats employ the sonar especially when hunting and flying through cave... |
12 November 2007
03:29 GMT |
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1. A croak is produced by frogs by pushing air through the larynx in the throat. Most frogs have vocal sacs that amplify the sound. These are elastic skin membranes that work by distention. Tree frogs, toads and most South American and Australian frogs have just one vocal sack located under the throat (it can be larg... |
29 September 2007
06:14 GMT |
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Those bat species that emit ultrasounds to spot prey and avoid obstacles present a high variation in the FOXP2 gene, pointing that mutations in the gene boosted the evolution of the bat sonar. The protein encoded by FOXP2 appears to control coordination between mouth muscles and speech. In 2001, it was connected to s... |
26 September 2007
02:48 GMT |
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For a long time now, humans have been fascinated by the spectacular fights between the huge sperm whales and giant squids, that triggered the myth of the kraken, the island big sea monster. But how do the whales manage to detect the squids in the complete darkness of the deep ocean? It's all in their ultrasound ... |
11 September 2007
07:23 GMT |
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Inner organ damage caused by the crush against the steering wheel is one of the main causes of death in car accidents. A team at the University of Washington has been collaborating for over a decade with doctors at Harborview Medical Center to develop a new emergency treatment that seems depicyed from Star Trek: a tr... |
11 September 2007
03:24 GMT |
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We, humans, live in a visual world. 90 % of our information concerning the environment comes through our eyes. But if we refer to cetaceans (dolphins and whales), their world is mainly auditive. These animals practically "see" with their ears, employing the ultrasound ecolocation, as vision in the water is greatly im... |
24 July 2007
05:38 GMT |
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Seeing is not all about light, as sounds often produce accurate images of what light alone can't show us. Many applications use sound as imaging technique, like radars, sonars, echographs and telecommunication devices. Processing acoustic signals has just become more efficient with a new imaging algorithm that ... |
17 July 2007
05:48 GMT |
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Squids have excellent eyesight, a keen sense of smell, and the ability to squirt jets of dark ink that mask their escape. But these skills provide little protection against toothed whales, like the sperm whale, which hunt them ruthlessly and easily. "The numbers of squid that are eaten by sperm whales far exceed thos... |
28 June 2007
17:31 GMT |
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Bats definitely don't rise up to the human standard of beauty. They can be damn ugly with their minute eyes and huge ears. But some bring it to the extremes with the face covered by a multitude of leaf-like skin flaps. And they can get rave reviews when posed for the camera. As in the case of Maclaud's hor... |
25 June 2007
08:44 GMT |
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Poisonous or distasteful animals are more efficient in defending themselves with their chemical weaponry but they can also warn of this. That's why many insects, poisonous frogs or coral snakes, for example, display their vivid colors. But the method is so efficient with the predators, that many defenseless and ... |
31 May 2007
05:25 GMT |
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"Many people don't bother to brush or floss their teeth properly!". I'm guessing that's what you hear in Colgate "close-up" ads. Not very convincing, eh? Well, maybe this will change the shape of things... and teeth (hopefully). The Ultreo is another milestone in the evolution of the modern toothbrush.... |
9 May 2007
04:58 GMT |
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Fingerprinting is probably the most widely used method of identifying individuals. The police uses this method to identify suspects by matching the fingerprints taken from a crime scene with those found in their databases, or with those of unrecorded suspects they encounter.Reliability comes from the fact that two ... |
7 May 2007
08:00 GMT |
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The latest fashion among young parents is to have pictures not only with your new-born baby, but also from before his birth. When the kid grows up, mom will tell him: "Look, this is you when you were...well...uh...minus three months old."The next big thing will be 3-D movies with the unborn baby, along with the fish... |
26 April 2007
09:26 GMT |
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