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Leonardo Santiago, 9, punches a hole through the bottom of a plastic cup with a wooden skewer during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. Leonardo teamed up with his friend Jose Onofre to build their zip line. (Tanzi Propst/Park Record)

Leonardo Santiago, 9, holds his team's zip line bucket in the air as his teammate Jose Onofre, 11, uses a wooden skewer to punch holes in the bottom of the cup during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The two needed to add enough weight to the bottom of the cup in order for it to slide down the string once it was tested for speed. (Tanzi Propst/Park Record)

Leonardo Santiago, 9, holds his team's zip line bucket in the air as his teammate Jose Onofre, 11, uses a wooden skewer to punch holes in the bottom of the cup during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The two needed to add enough weight to the bottom of the cup in order for it to slide down the string once it was tested for speed. (Tanzi Propst/Park Record)

Leonardo Santiago, 9, punches a hole through the bottom of a plastic cup with a wooden skewer during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. Leonardo teamed up with his friend Jose Onofre to build their zip line. (Tanzi Propst/Park Record)

Adley Gramann, 8, tests out her zip line bucket on an extra piece of string she found during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Charlie Ginster, 8, works on his zip line bucket on the floor during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Charlie Ginster, 8, works on his zip line bucket on the floor during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Charlie Ginster, 8, works on his zip line bucket on the floor during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Madi McIntyre hands out crafting supplies in exchange for "dino dollars" during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Parker Taix, 9, middle, gets excited to test out his zip line during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Charlie Ginster, 8, wishes his zip line good luck as he sends it down the string during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

Charlie Ginster, 8, giggles he sends his zip line down the string during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)

The Swaner Scientists summer camp class crowds around the zip line as they eagerly await to test their creations out during the Swaner Scientists summer camp Thursday afternoon, July 20, 2017. The camp focused on exploring simple engineering projects such as building bridges and zip lines. (Tanzi Propst/Park Record)