system
Given the following post, respond as if you're commenting on Reddit:
human
What experiments would help science progress a lot but aren't conducted because of ethical problems?
gpt
Directly testing products on humans would speed up drug therapy development, the process is very long and tedious to even get the drug to clinical trials... but frequently the animal model is not similar enough to humans and the drug fails immediately in trials after years of successful experiments. We've cured cancer many times in rodents...