Hardwritten card in blue pen on white paper, offering condolences following the October 27 attack.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Keep Going" surrounded by stars, arrows, and other floral motifs. The back contains a handwritten note, featuring a quote from the British historian, Richard Evans, as well as the stock signature: "From your friends at West Allegheny Middle School."

Card from the Friendship Circle of Illinois. The card reads: "To the Jewish community of Pittsburgh sheyichyu (may they live), I will daven for you and give extra tzadakah (charity) and nothing else should happen like what just happened and when moshiach (the Messiah) comes [?] and Hashem will do t'chiyat hameitim (resurrect the dead). The rest of your life should be successful. From so and so... which." The acronym "BS"D" (with the help of heaven), a common header in traditional Jewish letter-writing, appears in the upper left corner.

Post-it note with handwritten message in blue ink. The message reads: "We love you and support you." Color bleeding due to exposure to the elements at the Wilkins memorial.

Hardwritten card in blue pen on white paper, offering condolences following the October 27 attack.

Printed tag with a photograph of Daniel Stein. The tag reads: "In Memory of Daniel Stein." Creasing and staining due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message with blue marker. The message reads: "Stronger Than Hate!" Illustrated with a heart and signed: "TR."

Handwritten note written in black ink on light yellow paper. The note reads: "Dear God, Let love prevail... Let hate fail... Blessed those affected by this terrible act... A Pittsburgher."

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. The inside reads: "Sorry for what happen on Saturday. I prayed for you. Love, Holy Angels CCD." Color bleeding due to water exposure at the memorial site.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Brothers and Sisters LOVE conquers all!!!"

Paper program booklet with image of light blue sky on the cover. Typed text throughout booklet. Contains introductory remarks from Executive Director Dr. Zipora Gur, agenda for conference with summaries describing each presentation, biographies of presenters, descriptions of exhibits associated with the conference, resource lists, acknowledgements, and evaluation form.

Silver box with metallic polka dot lining used to hold the cards sent by students at West Allegheny Middle School in Imperial, Pa. A handmade card with a tree at the center glued to a green ribbon is tied with a bow in the center. The tree trunk is adorned with a banner, reading: "Please take what you need" and is signed: "West Allegheny Middle School" with a heart.

Garland of synthetic white roses, green leaves, and ivy.

Handmade card in colored pencil on paper. The outside features a series of staples running down the side and two hole punches. Cream-colored yarn is tied in a bow around the left-hand hole. From right to left, the inside reads, in Hebrew: "Zachor" (remember) and "Love, Cat Dog. Me and family are so sorry." Assorted hearts appear on the right flap; a group of multicolored blocks with a heart-shaped cat or dog face on top appears on the left. The back is signed, on the lower center: "From Aviva and Shosie."

White windbreaker jacket with black zipper. Pittsburgh Marathon logo on upper right front. Asics logo on upper left front.

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front cover contains the following quote attributed to O.G. Mandino: "Failure will never overtake me if my determination to succeed is strong enough." Illustrated with the image of two stick figures, labeled "strength" and "failure" respectively standing on either side of a wall. The inside reads: "Dear Congregation of the Tree of Life, I am sorry for what happened and I hope everything gets better.

Large square card from a student at Fountain Valley School in Colorado Springs, Co. Card on white paper overlaid with a papercut Star of David set on grey background. Card reads: "Dear members of Tree of Life, I am a history teacher to high school students from all over the world at the Fountain Valley School of Colorado. My students and I were horrified to hear about the hateful shocking event at your place of worship. My students have been studying about peace and the flip side- hateful rhetoric. They were motivated to reach out and share their messages of support.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Tree of Life, I bleed for you and with you. My soul hurts for you. I stand with you in your faith. I pray for healing. Lola. Point Loma Community Presbyterian Church."