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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Erythema infectiosum, Fifth disease Erythema infectiosum, Fifth disease
Parkinson’s disease. Parkinson’s disease.
Goiter as commonly seen in autoimmune thyroid disease. Goiter as commonly seen in autoimmune thyroid disease.
Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient. Muscle weakness caused by myasthenia gravis is evident in the eyes of this patient.
Association of Different HLA Alleles and Increased Susceptibility to Autoimmune Diseases Association of Different HLA Alleles and Increased Susceptibility to Autoimmune Diseases
Spirochete that Causes Lyme Disease Spirochete that Causes Lyme Disease
Video: Bond in biological molecules (Ionic, Covalent and Hydrogen bonds)/ How atoms bond?

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