Riddle Me This

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This logic puzzle was published in Martin Gardner's column in the Scientific American. You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

by the way I was wondering what people thought of me making a breast cancer awareness thread  cause in Australia, October is breast cancer awareness month so I just thought for the girls to encourage them to get checked out and to honour those who have it, have had it and who have passed from it. What do you think?
 
Three missionaries and three cannibals want to get to the other side of a river. There is a small boat, which can fit only two. To prevent a tragedy, there can never be more cannibals than missionaries together.
How could all of them get safely across the river?
 
1st trip 2 cannibals, only one gets off, then a missionary crosses, and gets off , then another missionary, and then final missionary, and then cannibals (one rides whole trip) all get off
 
1st trip: cannibal and missionary. Leave the C there. M travels back.
2nd trip: M and M travel across. M left with C. M travels back.
3rd trip: Last M picked up. Travel across. Leave M, M travel back.
4th trip: M pick up C, Travel across, leave C there, M travel back.
5th trip: both M and C together, both get off at other side.

One day Kerry celebrated her birthday. Two days later her older twin brother, Terry, celebrated his birthday. How come?
 
Twin Birthdays: At the time she went into labor, the mother of the twins was travelling by boat. The older twin, Terry, was born first, early on March 1st. The boat then crossed the International Date line and Kerry, the younger twin, was born on February the 28th. In a leap year the younger twin celebrates her birthday two days before her older brother. ?
 
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