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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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