Carbon monoxide detectors sound an alarm when they sense a certain amount of carbon monoxide in the air over time. Different types of alarms are triggered by different types of sensors. 1  Biomimetic sensor: A gel changes color when it absorbs carbon monoxide, and this color change triggers the alarm.
General Bad Days Similarly, some of the lethargy is simply as a result of reality. Having anxiety makes your day worse, and so there are many people that find they would rather sit in bed than deal with the anxieties of the day.
The Water Cycle. During the water cycle, water moves from one reservoir to another in a continuous motion. The sun heats bodies of water, which causes the water to evaporate. As it evaporates, it rises higher in the atmosphere, where the cold temperatures cause the water vapor to condense into clouds.