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Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

A headache in your forehead is often caused by a migraine or a tension headache. Rarely, it can be caused by a stroke. Tension headaches can be due to dehydration, eye strain, or muscle tension.

The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger and every process that regulates our body. Together, the brain and ...