You’ve probably heard of the chemical calcium in milk. But calcium shows up in lots of other stuff too. For example, the hard part of your bones and teeth is made from calcium connected to a chemical ...

Black soil is highly fertile and responsible for many of the world's crops. But do you need it in your home garden to make your veggie patch thrive?

Some cursory googling of these white deposits inside my kettle lead me to think it's calcium carbonate or limescale: So...does that look like the right diagnosis? The googling also told me that it's ...