Science teachers have appropriately earned a reputation for being the go-to person at my school- we always need and have a variety of objects on hand~ a collection of plastic spoons, baggies, clay, thread and yarn, various sizes of balls (excuse me, spheres!) Many times I have also made use of a "junk bucket," which for me is an old KU Jayhawk popcorn tin filled with stuff. A foam visor. A #6 birthday candle. A door knob. Minnie Mouse bubbles. Just a lot of random stuff that the kids find fascinating.