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?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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.
Quartz: the Silicon-Oxygen Mineral, SiO2
Faith Ringgold, God Bless America, No. 13 from the series American People.
Carrie Mae Weems, You Became a Scientific Profile, from the series From Here I Saw What Happened ...
Voltmeter hookup to test the voltage drop of the charging circuit.
The muscle-spindle feedback circuit
The figure shows an LR circuit with a switch and a 240-volt battery. At the instant the switch ...