Adolescence /ˌæd

the Internet , also the internet /ðiˈɪn.tə.net/ /-t ̬ɚ-/ noun [ S ] ( informal the Net )
the large system of connected computers around the world which allows people to share information and communicate with each other using email
I found out about the bombings from/on the Internet.
investigation /ɪnˌves.tɪˈgeɪ.ʃ ə n/ noun [ C or U ]
the act or process of examining a crime, problem, statement, etc. carefully, especially to discover the truth
An investigation has been under way for several days into the disappearance of a thirteen-year-old boy.
a full/thorough investigation of the incident
Currently, the individuals who might have caused the accident are subject to/under investigation.