Ride bikes every day!

Yeah we can't literally know what cats are thinking, but humans do tend to anthropomorphise so we can't really help attributing our observations of their behaviour into what we believe they are thinking. Very egotistical of us.

My observation they think we are a bit useless comes from the 'gifts' behaviour of bringing things into the house. My cat brings in small lizards- thanks buddy! Could be any number of reasons they do it, but I find it amusing to ponder if he thinks I'm not good at hunting, so he better take care of this important cat business.

Used for humidity measuring instruments primarily, like a psychrometer.

Basically using a wick or wet material and forcing air over the sensor will evaporate the water and lower the temperature reading. Compared to a dry thermometer you can work out humidity.

A very high wet bulb temperature would mean very high humidity, which is dangerous for people as sweating is less effective.