Why do we see lightning before we hear thunder?

What causes bread to rise while baking?

Why does ice float on water?

Which gas do plants release during photosynthesis?

Why do we sweat on a hot day?

Which part of the eye controls the amount of light entering?

What is the main reason for iron nails getting rusty?

Why does salt help in melting ice on roads?

What makes soap clean grease and oil?

Why do metal spoons feel colder than wooden ones in the fridge?