February 29 is a date that usually occurs every four years, and is called a leap day.
This day is added to the calendar in leap years
as a corrective measure, because the earth doesn't orbit the sun in precisely 365 days.
(The Gregorian calendar is a modification of the Julian calendar first used by the Romans.)
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your answer is Rubella can cause deafness, heart problems, and intellectual disability in a developing fetus.
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