Appendix:Polish surnames. Polish surnames are known from the Middle Ages, but only 200 years ago did the inherited surnames become compulsory. The most common Polish names Nowak, Nowakowski, Nowacki, and Nowicki are variants meaning new, Przybyszewski and Przybylski mean he who has arrived.
Beta Waves. Beta Waves, sometimes also called the beta rhythm, is the frequency of the electrical activity in the brain that falls between 12 and 30 Hz and is the state that is associated with normal waking consciousness. These brain waves are classified as low and high amplitudes.
Delta Waves. Normal Occurrence of Delta Waves. Delta waves are slow EEG waves that oscillate from about .5 to 4 times per second. Delta waves tend to be large in amplitude. Delta waves are rarely seen in the healthy waking adult EEG but are prominent and normal during sleep, especially of infants, children, and young adults.