irregular rising and falling in number or amount.

joining or linking things together. To become friends with another person.

Not normal, not typical, not usual, not regular.

Taking your attention; making you want to know. To persuade to do, become involved with something.

To become aware of or understand mentally.

Device that starts a process. To start a process off e.g. a memory.

A bitter, volatile compound obtained from cacao seeds. It is an alkaloid resembling caffeine in its physiological effects..

substance that raises levels of physiological or nervous activity in body. Drug that increases physical or mental activity.

Causing trouble. Question to show understanding of a math concept.

A common, soft, silvery white metal with many uses.

noticeably rapid, strong, or irregular heartbeat due to agitation or illness. Rapid and irregular heart beat; a shaky motion.

Referring to an unspecified amount or quantity. some.

muscular membranous sac in abdomen which receives urine from kidneys and stores it for excretion. Part of the body that holds urine.

A medical operation.

alkaloid compound which is found in tea and coffee plants.