One day a girl celebrated her birthday. Two days later, her elder twin brother celebrated his. How is this possible?

Answer by William Chen:

The twins were travelling eastwards across the International Date Line during their birth.

The elder twin brother was born first, on March 1st. After they crossed the International Date Line, the younger sister was born, on February 28th.

On a leap year, their birthdays are 2 days apart.

One day a girl celebrated her birthday. Two days later, her elder twin brother celebrated his. How is this possible?

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