Traditionally, some textbooks from the United States used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria) while textbooks in Great Britain, India, Australia, Latin America and other countries used five kingdoms (Animalia, Plantae, Fungi, Protista and Monera).
For other uses, see Placebo (disambiguation) and Placebo effect (disambiguation). The placebo effect can be produced by inert tablets, by sham surgery, and by false information, such as when electrical stimulation is turned off in those with Parkinson's disease implanted brain electrodes.
Unsteadiness Unsteadiness (disequilibrium) or loss of balance when standing or walking are often experienced along with vertigo and other types of dizziness. The causes include: 1  Inner ear problems. 2  These can cause sensations of floating or unsteadiness, especially in the dark. 3  Vision problems. 4  Cataracts, macular degeneration, glaucoma and weakening eyesight (reduced visual acuity) are risk factors for disequilibrium. 5  Numbness.