Assertion: obsidian scalpel | /r/HasProperty | prone
Facets:
Source sentences:
text: But there has been little academic research into the efficacy of obsidian blades compared with steel scalpels, and they do have disadvantages: Obsidian scalpels are not Food and Drug Administration-approved, and they are extremely brittle and prone to breaking if lateral forces are applied, meaning they are unlikely to ever be in widespread use.