How to grow an avocado tree

This week we are making an Avocado Pit. It's going to take a few weeks so bear with us.

My 4-year-old thought he could plant a stick, and if he watered it, it would turn into a tree, so I thought this would introduce him to the concept of a root.

How to grow an avocado from a pit

Cut the avocado carefully, trying not to injure the stone ( pit ).
Wash the pit, to remove the flesh, but do not remove the brown outer covering, this is the seed cover.
Stick four toothpicks into the pit to a depth of about 5mm.
Fill a glass jar with water and place the pit on top, balanced with the toothpicks. It should be half covered with water, with the pointed end up. Leave it on a windowsill or somewhere else, and it will get lots of light.
Change the water every two days to prevent mould and contaminants from damaging the roots. Make sure you keep the base submerged in water.
Wait and watch. The brown outer layer should wrinkle and come off, the pit should start to split, and a root should emerge from the bottom.

Further instructions and the science behind it to follow!