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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.

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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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.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

How phytochrome acts as a molecular light switch. How phytochrome acts as a molecular light switch.
Historical timeline of regulatory acts, standards, and organizations. Historical timeline of regulatory acts, standards, and organizations.
Spike Lee (director and producer), When the Levees Broke: A Requiem in Four Acts. Spike Lee (director and producer), When the Levees Broke: A Requiem in Four Acts.
NADH acts as a reducing agent in several reactions NADH acts as a reducing agent in several reactions
Natural selection acts on genetic variation Natural selection acts on genetic variation
The enthalpy change for converting 10.0 g of ice at -25.0 C to water at 80.0 C is ________ kJ. ... The enthalpy change for converting 10.0 g of ice at -25.0 C to water at 80.0 C is ________ kJ. ...
Video: The Lac Operon in E. Coli

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