The role of histamine (HA) as a neurotransmitter in the CNS, although proposed a decade ago (Schwartz, 1975), has been only progressively recognized (reviewed by Schwartz et al., 1980, 1982, 1984; Hough and Green, 1984). One of the key pieces of expenmental evidence has been the demonstration that synthesis of the amine in CNS depends on a specific enzyme, L-histidine decarboxylase (HDC) (Schwa...

[1] Schwartz [2007] recently evaluated the time constant of Earth’s climate system. However, his methodology yields to a significant underestimation of the value of t and obscures a much more interesting property of the system. Schwartz found t = 5 ± 1 years. Herein, by using an improved methodology I find that for short time scales from 0 to 2 years t is of the order of a several months and fo...