Oddly enough, in Australia there are certain scenarios where increasing your pay can make you earn less. The marginal rates work as described, but due to convoluted children's benefits and other concessions, there is a band of income, between low and medium, where you go backwards first. It affects students and low income parents the most, and is very frustrating.

Ketamine is the most widely used anaesthetic in the the world.

In the developed world for intubation of severe asthmatics, hypotensive trauma victims, and for sedation of children for short procedures.

In the majority world it is widely used as it can be given intramuscularly or intravenously and is the safest to use without cardio-respiratory monitoring.