A lot of great information about brain waves can be found by visiting the yourbrainwaves website. Once on the site, hover over the brain basics tab at the top and then click the brainwaves option on the drop down menu.
Thoughts
Brainwave are the pattern of waves produced by brain. These waves can vary in their frequency and based on the frequency produced they are categorised as beta brainwaves, alpha brainwaves, theta brainwaves, delta brainwaves and gamma brainwaves. Brain will be at different state whilst producing different frequency.
No.
Brainwaves in a crossword is usually "ideas."
No. ----
minds or thoughts
ideas
No.
There are no currently defined terms where one individual can send their brainwaves to another. They are doing experiments but the results are usually within the margin of happenstance. The best at the moment is being able to tell what someone is thinking if the individual has known them for a long period of time.
ideas
ideas
ideas