Amesha Banjara, 8, tests a batch of slime she made at Helix in Los Altos, Calif., on Sunday, Dec. 15, 2013. Helix is a new community science center
Amesha Banjara, 8, tests a batch of slime she made at Helix in Los Altos, Calif., on Sunday, Dec. 15, 2013. Helix is a new community science center operated under auspices of the Exploratorium. (Jim Gensheimer/Bay Area News Group)