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  2. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

  3. Vitamin B12 Deficiency: Causes, Symptoms, and Treatment - WebMD

    www.webmd.com/diet/vitamin-b12-deficiency...

    But if untreated, it may lead to symptoms such as: Weakness, tiredness, or lightheadedness. Heart palpitations and shortness of breath. Pale skin. A smooth tongue. Constipation, diarrhea, loss of ...

  4. How Long Does Weed Stay in Your System: Urine, Blood, Hair?

    www.webmd.com/mental-health/addiction/what-to...

    Typically, weed will remain longer in hair and can be detectable for up to 90 days from the day of use. Tests can detect weed for up to 30 days in your urine, up to 24 hours in your saliva, and up ...

  5. Ovulation Calculator & Calendar - Determine Your Most Fertile ...

    www.webmd.com/baby/healthtool-ovulation-calculator

    Ovulation usually happens 14 days before your next period begins, but it can vary from month to month -- even in women with regular cycles. To get a better sense of when you’re ovulating, chart ...

  6. Canker sores are small, shallow wounds in your mouth that can make eating & talking uncomfortable. Learn more about causes, symptoms, diagnosis, treatment, remedies, & prevention.

  7. Erectile Dysfunction: Erection Problems, Treatment, Surgery ...

    www.webmd.com/erectile-dysfunction/erectile...

    Placement of an implant ( prosthesis) in the penis. Vascular reconstruction surgery to improve blood flow to or reduce blood leakage from the penis and surrounding structures. This procedure works ...

  8. Boils: Pictures on Skin, Causes, and Treatment - WebMD

    www.webmd.com/skin-problems-and-treatments/ss/...

    2 /19. Boils are usually pea-sized, but can grow as large as a golf ball. Symptoms can include: Swelling, redness, and pain. A white or yellow center or tip. Weeping, oozing, or crusting. You may ...

  9. A Visual Guide to Erectile Dysfunction - WebMD

    www.webmd.com/erectile-dysfunction/ss/erectile...

    7 /25. Lifestyle choices can contribute to ED. Smoking, heavy drinking, and drug use disorder can damage the blood vessels and reduce blood flow to your penis. Being overweight and getting too ...