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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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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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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Allium cells in different phases of the cell cycle Allium cells in different phases of the cell cycle
Structure of an animal cell Structure of an animal cell
IgE binding to a mast cell. IgE binding to a mast cell.
Antigen presentation to a T cell. Antigen presentation to a T cell.
Color-enhanced electron micrograph of E. coli undergoing cell division Color-enhanced electron micrograph of E. coli undergoing cell division
Write equilibrium constant expressions for the following reactions in terms of concentration: Write equilibrium constant expressions for the following reactions in terms of concentration:
Video: baroreceptors

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