When animals use celestial cues to navigate
In recent years there have been some spectacular astro-physical successes with the Cassini probe, the comet visit by Rosetta, the Pluto flyby etc. coming to mind. Successes, which were so fantastic that almost everyone must have heard of them. We do look at the stars and are fascinated by the world beyond our own. But animals, too, look at the heavens and see the stars, the sun and the moon – and many species actually make use of what they see up there. —>
Life is a continuous struggle – is there anyone who’d disagree? Life is a race, a race of the fittest to survive as Herbert Spencer observed 150 years ago after reading Charles Darwin’s “On the Origin of Species” opus. And it starts with the sperm. In most animal species the male gametes, also known as spermatozoa or spermatozoons, vastly outnumber the eggs and often the ratio is millions to one. It is therefore only an incredibly tiny percentage of sperm that are successful and meet, enter, and fuse with the egg cell nucleus to start a new individual. —>
Is there any risk?
At my last university I had a colleague who was very successful in obtaining research grants for projects related to possible adverse effects of mobile phones. Using rats, mice or hamsters he and his co-workers exposed the experimental rodents to stimuli that were hundreds of times stronger than what the ordinary human mobile phone users would be exposed to. And the result: as far as I remember, apart from some very minor effects no dramatic changes, no cancers, no untimely deaths, no fertility problems. —>