Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.
Did you know?
Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
Map of Mars from Hubble Space Telescope as seen near the 1999 opposition. (North top)
Kreutz Sungrazers (SOHO-54 & 55) with prominent tails, as seen by SOHO on June 1 and 2, 1998.
Escape Itineraries of Some Prominent Fugitive Slaves
Opposition—on Both Sides
The “first wave” of the U.S. women’s movement met enormous opposition. The women in this 1920 ...
Reed-Sternberg cells: Bilobed nucleus coupled with the prominent nucleoli gives this cell the ...