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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
![Peptic ulcer. A peptic ulcer may occur in the stomach (gastric ulcer), as shown here, or in the duod](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_23_53_96882468.jpeg)
![Mechanism of action of antipsychotic drugs: (a) overproduction of dopamine; (b) antipsychotic medica](https://biology-forums.com/gallery/47/medium_6_26_12_14_9_03_31_196491625.jpeg)