Wrap the baguette in a clean, slightly damp kitchen towel
Microwave it for 10 to 15 seconds
Warm it in a 300°F / 150°C oven for 5 to 10 minutes after lightly spritzing it with water
Steam it by placing it over boiling water for a few seconds
Store it in a sealed plastic bag with a slice of apple or a piece of damp paper towel for a short time
Slice and toast it lightly if you want a softer interior with a crisp exterior
Use it in soups, sandwiches, or bread pudding if it has already hardened