Podcast and fitness tracker: what they have in common

1. Step 1. Podcast — uses — MP3. Audio files.
2. Step 2. MP3 — is used in — MP3 player. The MP3 format.
3. Step 3. MP3 player — has part — Headphones. Headphones.
4. Step 4. Headphones — evolved into — Wireless earbuds. Wireless headphones.
5. Step 5. Wireless earbuds — uses — Bluetooth. Bluetooth.
6. Step 6. Bluetooth — is part of — Fitness tracker. A link to the phone.

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