Probably a butterfly... (View Post)

I'm not so sure. It is something that I have been trained to do and I don't think I that much more intelligent than the rest of the posters on here. (View Post)

I'm a physics teacher: you would be amazed how many people have a problem with the difference between an amount and the rate of change of that amount. You have now said the rate at which they are fal… (View Post)

What we see in the mirror? :smiley: (View Post)

From the point of view of our economy I agree. From the point of view of reducing our CO2 production, why does it matter? (View Post)