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Do you see what I see?
Learningpost, David Canavan, Published on 09/02/2010
» The eye is an exceptional organ although the effectiveness of an animal's eye depends on how much it relies on sight and the environment in which it lives. Arguably, birds of prey, such as eagles and falcons, as well as scavenging vultures, have the most advanced eyesight, and they are able to spot tiny prey scurrying among the bushes or a carcass from kilometres away.
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Sonar
Learningpost, David Canavan, Published on 26/01/2010
» I have a question for you, the answer to which I will give you at the end of this article. You are on a boat looking for a school of fish when your sonar finally finds a school. It emits a "ping" that travels at the speed of sound, which is about 1,500 metres per second in water, and the reflected sound is received half a second later. Using the formula distance equals to speed multiplied by time, work out how deep the fish are, but be careful - there is a catch (pun intended).
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