Winterbottom’s sign
(Science: clinical sign) swelling of the posterior cervical lymph nodes, characteristic of early stages of african trypanosomiasis; useful for surveys or control of migrations from endemic areas of persons with preclinical infections.
Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
The movement of molecules (specifically, water and solutes) is vital to the understanding of plant processes. This tuto..
Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..