The nicest way is to use a Google account [free] , and upload your photos to Google+. If you use the standard filesize, all pix are free to store. Then use the Google+ Slideshow Feature, as you use the Google Cast Extension casting function.
Explain that water is made up of tiny particles, called molecules, which are too small to see. These particles are always moving, even in very cold water. Since water molecules move, the molecules help mix the food coloring. However, the color mixed faster in the hot water than it did in the cold.
In diffusion, solute molecules move from an area of high concentration to low. No barrier ( like a cell membrane) is required. In osmosis, water molecules move from an area where they are relatively concentrated (I.e. a dilute solution) to a solution that is more concentrated (where there are more solute molecules and fewer water molecules).