Young men, Slaughter says, speaking up for better, more flexible policies for themselves, are critical to moving the needle towards more flexible policies for women.

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Then a thin, flexible wire was threaded through the needle, and the needle and catheter were removed.

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The deeper the needle penetrated, the more flexible the nail. (The squeamish may wish to note that this test can be done using a fingernail clipping.) In a test of 30 people, Dr Towler found that the nails of those with osteoporosis were significantly softer than those of people without it.

ECONOMIST: Medicine