The 3rd result on duckduckgo.com is learntherisk.org. That result is not presented in the first 10 pages of results on Google.
It seems quite likely to me that one of these sites is manipulating search results. Because the organic search results for these two different search engines should not be that far apart.
Edit: Why the downvotes? Here is an even more egregious example:
Note that I am not promoting an agenda here. This seems like an example of manual manipulation. The article sites "vaccinations and autism" as an example.
Web sites themselves manipulate search results to appear higher in the results than they might seem to merit, so a naive presentation algorithm is also "manipulated". Any ordering represents somebody's opinion on what you should get back; there is no single universal objective search result order.
I have no idea if Google is specifically pushing vaccine denier sites down the list, though I can say that the entire concept has far more "mind share" than the notion merits scientifically. That much, at least, is objectively true.
https://duckduckgo.com/?ratb=c&q=autism+vaccine+link&t=h_&ia...
https://www.google.com/search?q=autism+vaccine+link
The 3rd result on duckduckgo.com is learntherisk.org. That result is not presented in the first 10 pages of results on Google.
It seems quite likely to me that one of these sites is manipulating search results. Because the organic search results for these two different search engines should not be that far apart.
Edit: Why the downvotes? Here is an even more egregious example:
Try searching for "learn the risk autism".
https://duckduckgo.com/?ratb=c&q=learn+the+risk+autism&t=h_&...
https://www.google.com/search?q=learn+the+risk+autism
Note that I am not promoting an agenda here. This seems like an example of manual manipulation. The article sites "vaccinations and autism" as an example.