Balsa wood is one of the seventeen Infinitely Useless Objects as defined by Pope. Francis in his bestseller The Holy Bible Vol. 11. It is regarded as useless because...
Oh, just go and read this article for the reasons.
For a useless material its uses are numerous:
- IKEA furniture
- Hip replacements
- Scale models of buildings
- Actual buildings (usually due to a rather predictable materials-related error on the part of the builders)
- Fake walls(fake walls) in slapstick movies
- your chair. The one you're sitting on now. It looks a bit shaky.
- Eye glass lenses.