Fizzy Rocket A-S Boat

If you put an Alka-Seltzer in a half-full film canister and seal it, the pressure of the releasing gas will make the lid pop off after ten second or so (KEEP YOUR FACE / EYES AWAY FROM THE LINE OF FIRE). If you turn it over on the ground, the whole canister will launch up. The trouble is that the second you put the tablet in, it begins to dissolve. I designed this little boat to float the tablet in the water, keeping it dry and giving you time to get the lid on. Turn it over on the ground, get back, and it will fly upwards.