Final answer:
Obsidian tools are not 500 times sharper than a razor.
Step-by-step explanation:
The statement that obsidian tools were/are about 500 times sharper than a razor is False.
Obsidian is a volcanic glass that was used by early humans to make tools. While obsidian is extremely sharp, it is not 500 times sharper than a razor. A razor blade is made of metal and is designed specifically for cutting hair, making it much sharper than an obsidian tool. However, obsidian tools were still very effective for cutting, scraping, and chopping tasks.
Therefore, the correct answer is (b) False.