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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
The horizontal fraction bar was introduced by the Arabs.
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.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
![Starting at the waist, apply circular two-handed petrissage over the entire right side. Keep hands ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_12_54_25_33052685.jpeg)
![Apply direct pressure along upper trapezius, turning the head to access the area. Use your thumb to ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_35_46_33148649.jpeg)