What is consciousness, and how can we tell who—or what—has it? Consciousness is the ability to have experiences, such as seeing, feeling, thinking, or knowing that you exist. Scientists believe it depends on the brain, but they still do not fully understand how it works. Studying consciousness is difficult because it is personal and cannot be directly measured. Researchers use tools like brain...
Although cannabis is a naturally occurring plant with a long history of use by humans, the chemicals it contains, called cannabinoids, can act on the human body in many ways. Use of cannabis during important periods of development, such as during pregnancy and adolescence, can have a long-lasting impact on the way the brain forms and develops its systems to control emotions and other functions....