People who work around machines use special equipment to protect their hearing. Low levels require one kind of protection, and very high levels require another type of hearing protection. This all makes it very important to measure noise correctly.
Quality sleep can be a huge part of how you feel every day. Learn about the science of sleep and dreams. Best of all, learn some new practices to boost your sleep.
In humans, it is called the circulatory system. In machines, it is called a hydraulic system.
Copper was one of the first metals humans ever used, marking such an important moment in history that we named an entire period after it: the Copper Age.
