[edit on Wikidata] A callus (or callosity) is a toughened area of skin which has become relatively thick and hard in response to repeated friction, pressure, or other irritation. Rubbing that is too frequent or forceful will cause blisters rather than allow calluses to form.
This Day in History: 07/28/1868 - 14th Amendment Adopted. In a This Day in History video, learn that on July 28, 1868, the 14th amendment was adopted, guaranteeing citizenship to freed slaves. Former President Lincoln started the process with the Emancipation Proclamation, which led to slaves being freed.
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