The power of the sun is harnessed using a bottle full of water. Quite simply they’re used 2-liter soda bottles. They’ve been filled with water along with two caps worth of bleach to keep ...

Then cut the top off the 2 litre drinks bottle, making sure that the remaining bottom section is a bit taller than the bottoms of the two 1 litre containers you cut in the step above. If you have ...

A capped 2-liter plastic bottle containing a clear, colorless liquid is shaken. The liquid turns a deep blue color. At rest, the liquid returns to colorless. The cycle can be repeated many times. Ask ...