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When does perigee occur?
"Peri-", meaning "near", and "gee" as an abbreviation for the Earth's gravity; "perigee" is the point in any orbit when a satellite is as close to the Earth as it ever comes. The Moon orbits the...
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Down synndrome often occurs when?
The Occurrence of Down Syndrome
Most of the time, the occurrence of Down syndrome is due to a random event that occurred during formation of the reproductive cells, the ovum or sperm. As far as we...
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How often does leap occur?
every 4 years.
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How often does genital herpes occur?
Estimates are 1 in 4 adults, or 25% have genital herpes.
If you are infected with genital herpse (and the above 1 in 4 statistic is correct) then recurrences tend to occur anywhere on average 2 to...
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What is an eclipse and how often does it occur?
A lunar eclipse occurs when the Moon passes through the Earth's shadow, which can only occur when the Moon is on the opposite side of the Earth from the Sun - which would normally be when we would...