Sakia and zip: what they have in common

1. Step 1. Sakia — uses — Domestication. It is turned by oxen or donkeys.
2. Step 2. Domestication — is used in — Plough. Draught animals.
3. Step 3. Plough — uses — Wedge. The ploughshare parts the soil like a wedge.
4. Step 4. Wedge — is part of — Zip. The slider works like a wedge, bringing the teeth together and pushing them apart.

Open Evothings