White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell.
The chicken sandwich: In 1946, Atlanta restaurant owner Truett Cathy created an alternative to the hamburger when he placed a piece of boneless grilled chicken inside a bun and dubbed it the “Chick-fil-A.” Now more than 70 years and 1,500 restaurants later, Chick-fil-A’s slogan is, “We didn’t invent the chicken.
According to the established wisdom for some 90 years, many of the smaller rocks making up Stonehenge come from the Preseli Hills in Pembrokeshire, Wales. In 1923, geologist Herbert Henry Thomas first identified an outcrop known as Carn Meini as the source of the spotted dolerite bluestones used to build Stonehenge.