Title: Now You Know (novel)
Content:   Now You Know is a 1993 novel by British author Michael Frayn.
Title: Now I Know
Content:  "Now I Know" is a song written by Cindy Greene, Don Cook and Chick Rains, and recorded by American country music artist Lari White. It was released in September 1994 as the second single from the album Wishes. The song reached number 5 on the Billboard Hot Country Singles & Tracks chart.
Title: Now I Know (novel)
Content:  Now I Know is a young adult novel by Aidan Chambers, first published in 1987. It is a meditation on faith and religion through three interlinked stories, which are told by means of letters, jottings, flashbacks, poetry and puzzles. The novel is part of the author's Dance Sequence, a group of novels which stand alone but can be read in relation to each other. As part of Chambers' interest in experimental writing, he refers to Tom Phillip's remarkable A Humument: a Treated Victorian Novel (Thames & Hudson, 1980), a modern work that is created from the pages of an actual Victorian novel by painting over most of the words of the original, creating illustrations and decorations, while leaving enough of the original words on each page to tell a total new story. Chambers includes a similar experimental collage-like page of image and text.
Title: Know by Now
Content:  "Know by Now" is a song by English singer Robert Palmer, released in 1994 as the second single from his twelfth studio album Honey. The song was solely written by Palmer and co-produced by Palmer alongside Stephen Hague.
Title: Now I Know, Don't Be Scared
Content:  The episode title "Now I Know, Don't Be Scared" is taken from the song "I Know Things Now" from Stephen Sondheim's musical Into the Woods.
Title: You I Know
Content:  "You I Know" is a song by New Zealand musician Jenny Morris. It was released in July 1987 as the third single from her debut studio album, Body and Soul (1987).
Title: Know (song)
Content:  "Know" is a song by American singer Mary J. Blige. It was written by Blige, Mark "Sounwave" Spears, and Denisia “Blue June” Andrews and Brittany “Chi Coney” Coney from songwriting duo Nova Wav, while production was helmed by Spears. The song was released as a single on August 8, 2019, and peaked at number 12 on the US Adult R&B Songs.
Title: Now You Know (album)
Content:  Now You Know is the debut solo album by American musician Doug Martsch of indie rock band Built to Spill. Unlike Martsch's rock-oriented work with Built to Spill, the album touches on blues and folk in addition to rock. Now You Know was released in 2002 on Up Records label.
Title: Only You Know and I Know
Content:  "Only You Know and I Know" is a song written and originally recorded by Dave Mason in 1970. It is a track from his LP, Alone Together. The song was his first charting single, and it became a modest hit for him in the U.S. and Canada.
Title: I Know Things Now
Content:  "I Know Things Now" is the 44th episode of the ABC television series, Desperate Housewives. It was the 21st episode of the show's second season. The episode was written by Kevin Etten and Bruce Zimmerman and directed by Wendey Stanzler. It aired on Sunday, May 7, 2006. Due to time constraints, the opening credits were cut.

Question: Who is the author of Now I Know?
Answer: Aidan Chambers.