Mouthpiece and gyroscope: what they have in common

1. Step 1. Mouthpiece — is part of — Whistle. A channel for blowing in air.
2. Step 2. Whistle — is made of — Bone. Ancient whistles were carved from bone.
3. Step 3. Bone — is material for — Needle. The first needles with an eye were carved from bone.
4. Step 4. Needle — has part — Sharp point. It pierces the fabric.
5. Step 5. Sharp point — is part of — Spinning top. A fulcrum.
6. Step 6. Spinning top — works like — Gyroscope. A gyroscope is a top in a gimbal.

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