Post-it note with handwritten message in black marker. The message reads: "On the street where I lived many years ago. I remember it with calm and safety. May this spot once again, one day, be a place of comfort and peace for my Jewish community and all people."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "I am here in this moment" as well as arrows and other geometric motifs; a handwritten inscription appears above. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Post-it note with handwritten message in blue ink. The message reads: "I think about you constantly. Sending love." The Hebrew acronym, "with the help of heaven," appears in the upper right.

Card from a congregant at the Holy Angels Parish. The front cover contains a stock illustration of a haloed dove flying in front of Noah's ark. Due to water exposure at the memorial site, the message in this card has been partially erased. The remaining text reads: "everyone...we wish the best for everyone who was effected. Michael, Holy Angels CCD 6th grade."

Post-it note with handwritten message in black ink. The message reads: "We love you and we're with you."

Pamphlet from the Christian organization "Bridge to Salvation."

Laminated prayer card with text of the "Prayer to Our Mother of Perpetual Help" on the reverse. The front side features a reproduction of a medieval-style icon of the Virgin and child against a gold backdrop. This prayer card has the imprimatur of the former archbishop of Boston, William Cardinal O'Connell (1859-1944).

Zine page with bubble letters and information about the emotional value of hugs. Zine page with cartoons illustrating the emotional value of hugs, including a superhero, labeled "Hugs to the Rescue" and a young couple.

Floral tag from floral arrangement, which reads: "We are sorry for your loss and hope you feel better." Note is handwritten in black ink on a printed tag featuring a white rose on the left.

Floral tag from floral arrangement, which reads: "Love will always prevail. Together against hate." The message is written in black ink on a printed tag with multicolored flowers in the lower right corner. Tape in the upper center. The reverse is stamped with the contact information for Squirrel Hill Flower Shop.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside messages of condolence and prayer. The church's contact information is included on the back of the envelope.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains messages of love and support. The church's contact information is included on the back of the envelope.

Handwritten note written in yellow marker on a printed paper with a framed picture with leaves around the edges. The note is written inside the leaf frame and reads: "Eleven beautiful leaves for eleven beautiful sweet souls ripped away... Six strong trees for the six injured but here to stay. Hated can't weaken a city of steel."

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains messages of support and divine love. The church's contact information is included on the back of the envelope.

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover contains the following quote attributed to the movie star, James Dean: "Dream as you'll live forever, live as you'll die today." A Star of David appears below. Another quote, attributed to the author, August [middle initial and last name redacted] appears on the bottom right: "An empty box in an empty room is hard to fill, but over time it fills slowly..." An open, empty box appears above.

Typed letter addressed to Jerry Rabinowitz from Louis D. Louis identifies himself as a gay patient of Rabinowitz during the 1980s. He thanks for Rabinowitz for his sensitivity and care. The letter is enclosed in a plastic page protector and has tape residue on the back from the Wilkins memorial.

Pittsburgh Penguins hockey jersey with team logo on front and "Crosby 87" on back. Detail shows manufacturer's patch featuring the logo of Tree of Life-Or L'Simcha Congregation and the logo of the Pittsburgh Penguins above the words "Stronger Than Hate."

Handwritten card in red marker on paper. The card is signed: "Owen" and contains two illustrated stick figures.

Note addressed to Dr. Jerry Rabinowitz reading: "I will miss your Hello and smile all my days at Shadyside Hospital. Kelly [sad face]." Written on notecard which was cut in half.

Post-it note with handwritten message in black marker. The message reads: "Love is strongest power exists." A Star of David appears below.