Sharp point and vacuum pump: what they have in common

1. Step 1. Sharp point — is part of — Needle. It pierces the fabric.
2. Step 2. Needle — is part of — Syringe. A hollow needle.
3. Step 3. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.
4. Step 4. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

Open Evothings