Malaria is endemic to the tropics.

For the determination of the geothermal gradient, that is, the depths that must be reached in order to find increments of 1° C. in the temperature, the geothermometer is employed.

mental acuity

Conversely, as compared with a diesel in modern conditions, it is a weakness of the steam locomotive that the degree of enginemanship needed for a maximum effort is not always available.