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I noticed that if you ask for all items ordered by Popularity you get 38m results: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=&sort=byPopularity&type=all
But if you sort it by Date instead you get only 32.5m results: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=&sort=byDate&type=all
Can anyone help me understand this difference or point me to where it's been answered?