Today’s small delight is that most simple of pleasures – a glass of water. But what could be more refreshing on a hot day? Nothing quenches the thirst quite like water.

A simple pleasure – yet perhaps not quite so simple. Earth is the only known planet with a stable supply of liquid water. It is the origin of life. Our towns grew up around water sources. Rivers shape our landscape. Our bodies are made up of around 60% water. Almost two thirds of the world’s population are short of water for at least one month of the year.

Much to ponder as I sip from my glass and cool down.