I’m not sure about “we have learnt” should be the title this week of this regular post. Perhaps “I have learnt” would be a more appropriate title.
I have been reminded of how much energy it takes to boil a small amount of water. A friends husband at our homegroup barbecue got us to demonstrate this by means of heating it by pedal power. He and some friends had built a home-made pedal powered heater. Bits of bike attached to dynamo with a heating element in an insulated box. It took 5 of us with about 2 minutes pedalling each to get the cup of water boiling. And yet we flick the switch on a kettle without thinking about it. A picture can be seen on our Facebook page (link on the RHS).