Did you read the article? WIV collected dangerous coronavirus, mixed those virus's genetic material to make more infectious strains. They wrote scientific pape

Did you read the article? WIV collected dangerous coronavirus, mixed those virus's genetic material to make more infectious strains. They wrote scientific papers about this themselves, you can read them yourself. They tested these mixed viruses (called chimeric virus) on mice with human-like lungs to find the most dangerous and infectious ones. You can read about this in the grant funding for WIV. Then proposed splicing in the furin cleavage site into these dangerous chimeric viruses. The US funders balked at this last step, splicing the furin cleavage site in, and didn't give a grant grant money for this proposed step. It's not proven, but it sure seems like they actually did the research, because the furin cleavage site seems to be main thing that makes COVID-19 so infectious. They proposed testing these viruses on mice with human lungs and circulatory systems. so... do you now understand why people are talking about gain of function? Viruses like this don't exist in nature, and scientists are making them and then testing them on animals that have been genetically engineered to have human-like organs, so they can figure out how to make the most dangerous ones. This isn't new, there is a mission impossible movie where a chimeric virus is the boogie man. Making mice with human lungs and CRISPER is new, and then doing this level of research in place with the same level of biosafety as a dental office is a new wrinkle.