smartphone – n. a mobile telephone that can be used to send and receive e-mail, connect to the Internet, take photographs, etc.

pop up – v. re-appear; to appear in usually a sudden or unexpected way

gauge – v. to make a judgment about (something); to measure (something)

steward – n. someone who protects or is responsible for money, property, etc.

contribute – v. to help to cause something to happen

amaze – adj. feeling or showing great surprise