In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Evolution and Natural selection shapes organisms and diversity
Speciation produces new types of organisms
Keystone organisms "كيستون الكائنات الحية"
Genetic modification of organisms and DNA recombinant
Animated! Organisms are classified into groups according to their characteristics
1.6 Organisms are made up of cells, each of which contains an identical set of genes.