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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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. Why Is My Vision Blurry? Top 8 Causes of Sudden ... - WebMD

    www.webmd.com/eye-health/why-is-my-vision-blurry

    Itchy or sore patches of skin. Joint pain and inflammation. Thick, red, scaly patches on the skin. But psoriasis can affect your eyes, too. It can cause a condition called uveitis, when ...

  4. Swollen Ankles and Feet - WebMD

    www.webmd.com/a-to-z-guides/swollen-ankles-and-feet

    Blood clot. Blood clots that form in the veins of the legs can stop the return flow of blood from the legs back up to the heart and cause swelling in the ankles and feet. Blood clots can be either ...

  5. Blood Clot Symptoms: How to Tell if You Have One - WebMD

    www.webmd.com/dvt/blood-clot-symptoms

    Warm skin. The skin around painful areas or in the arm or leg with the DVT may feel warmer than other skin. Trouble breathing. If this happens, it could mean that the clot has moved from your arm ...

  6. Mucus in Your Chest: See 8 Causes (and How to Remedy It) - WebMD

    www.webmd.com/covid/mucus-in-chest-overview

    But too much mucus can be a sign of a health problem, like acid reflux, asthma, a cold, allergies, or an infection. Heavy smoking also produces mucus. To clear it up, stop smoking, if that's the ...

  7. Low blood sugar (hypoglycemia) People with diabetes need to check the amount of sugar (glucose) in their blood often. You can get dizzy if it drops too low. That also can cause hunger, shakiness ...

  8. Low White Blood Cell Count: Causes and Solutions - WebMD

    www.webmd.com/cancer/white-blood-cell-count-low

    Viruses can affect your bone marrow and cause low WBCs for a while. Severe infections, such as blood infections, can cause your body to use up WBCs faster than it can make them. Medicines: This is ...

  9. HbA1c (Hemoglobin A1c): A1c Chart, Test, Levels ... - WebMD

    www.webmd.com/diabetes/glycated-hemoglobin-test...

    A1c Levels. For people without diabetes, the normal range for the hemoglobin A1c level is between 4% and 5.6%. Hemoglobin A1c levels in the range of 5.7%-6.4% mean you have prediabetes and a ...