Headset Condenser Microphone with Moisture-repellent Protection and Cardioid Polar Pattern, for Shure Wireless (TA4F Connector)

Water Marbles 2 Color Liquid Motion Timer is a great visualization aid to show how water and oil don't mix. It's full of zigzagging, liquid motion fun. Turn this desk toy over and watch the 2 colored liquid drops make their way down the zig zag steps all the way to the bottom.