tick – v. to mark (something) with a written tick or check

diabetes -- n. medical: a serious disease in which the body cannot properly control the amount of sugar in your blood because it does not have enough insulin

imperfect – adj. having mistakes or problems : not perfect

plexiglass – n. a clear plastic often used in place of glass

shield – n. something that defends or protects someone or something

elf -- n. a small creature in stories usually with pointed ears and magical powers

interaction – n. the act of talking or doing things with other people