Mental health
Learning Center
Car sickness in children: Can I prevent it?
Carefully planned pre-trip meals, air ventilation and distractions might help prevent car sickness in children.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
Vitamin D deficiency
What are the risks of too little vitamin D?
Fallopian tubes: Is pregnancy possible with only one?
Pregnancy may be possible with one fallopian tube.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
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