Chapter 1
certain (adj.) definite, without any doubt
cycle (n.) an event or activity that changes from time to time
disturb (v.) to interrupt
effects (n.) results
experiments (n.) tests done to see if something works or happens
furthermore (adv.) in addition, also
influences (v.) to make an impression on someone, or inspire
memory (n.) recollection of past events
normal (adj.) as expected, typical, average
uncommon (adj.) unusual, not commonly found or experienced