Tuned directionality in cricket ears
Article Abstract:
Crickets have a pressure-difference hearing mechanism that enables them to determine the direction of a sound. The relative phases of sound between reaching the outer and inner surfaces of the tympanum gives the angle of sound incidence. This system frees crickets from the limitations of most small animals because crickets have a wider frequency band up to 4.5 kHz in comparison to most small animals with only a few kilohertz in low frequencies for communicating over distances.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Longevity and the barren aristocrat
Article Abstract:
Research indicates that human beings who bear few children tend to live longer than those with more offspring. Longevity investigations using historical genealogical data from British aristocratic families for 1,200 years since the year 740 indicate that the age has a negative correlation with offspring. The figures show that two-thirds of the women who died aged 81 years or younger had children.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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