Question: If the calculated activity (CI) is  4.96×10 −11, what is the specimen weight/size?
Schema: create table table_26211058_1 (specimen_weight_size varchar, calculated_activity___ci__ varchar, PRIMARY KEY (specimen_weight_size))
SQL: select specimen_weight_size from table_26211058_1 where calculated_activity___ci__ = "4.96×10 −11"