USB Rechargeable Milk Frother

Café-foam physics, powered by a whisk smaller than a pen.

Lab notes

• 14,000 RPM whisk turns cold or hot milk into microfoam in ~20 seconds
• USB-rechargeable — no battery drawer raids
• Works with oat, almond, and dairy
• Doubles for matcha, protein shakes, and salad dressings

The verdict

Your $6 latte habit, reproduced at home with lab-grade foam. Pays for itself by Thursday.