Never throw water on a grease fire. Instead, turn off the heat and smother it with a metal lid or baking sheet. Don't hesitate to call 911 if necessary.

But cold weather makes e-bikes feel weaker and shortens range. The reason is simple: lithium-ion batteries deliver less power when cold, and grease thickens, adding drag in bearings and gearboxes.

The solvent dichloromethane, or DCM, is commonly used to strip paint and cut grease. It's also what generations of chemistry ...