A son and his dad are out walking in the park and the son asks his dad a question.

“Dad why is the grass green?”  “Well son that is a good question, but I don’t know.”  Replies his dad.

They walk a little further past some flower beds and the son asks another question.

“Dad why is that flower yellow and that one blue?”   Dad replies “That is a really good question son, but I don’t know.”

They walk along past the lake and see some rowing boats with people in them, and sure enough the son asks another question.

“Dad why doesn’t that boat with all the people in it sink?” and you guessed it, dad replies “Now son that is a really clever question, but I don’t know.”

After they leave the park and were walking home the son says.

“Dad, you don’t mind me asking you all these questions, do you?”    Dad replies “Of course not son, how else will you learn anything if you don’t ask questions.”

So is this a case of a rather dim, but honest, father in today’s society?

In case you were wondering:

Grass is green because plants use light from the sun to make food.  This is called photosynthesis and uses a compound called chlorophyll that looks green.

A flowers colour is due to reflected light from the pigment in the plant.  There are many reasons that flowers have different colours, with the most important being the benefit that insects derive from flowers being “colour-coded”– pollination.

The standard definition of floating goes like this:

An object in a fluid experiences an upward force equal to the weight of the fluid displaced by the object. So if a boat weighs 100 kilograms, it will sink into the water until it has displaced 100 kilograms of water. Provided that the boat displaces 100 kilograms of water before the whole thing is submerged, the boat floats.

So go on, keep asking questions.

Finally, the apple is red because it absorbs all other wavelengths of light other than those which make up the colour red, this one it reflects, which we then see and interpret as red.   But you knew that!