Google has confirmed that they ran a “broad core algorithm update” last week that has impacted the appearance and rankings of some websites in the search results. Google posted on Twitter that Google does these types of updates “several times per year” and there is nothing a site can do specifically to “fix” their ranking after the core update runs. “Some sites may note drops or gains,” Google explained and said if a page drops, it doesn’t necessarily mean there is something wrong with that page, it is just how Google changed their ranking models that now benefits “pages that were previously under-rewarded.”
Google is now showing zero search results for some types of specific use cases. Zero results search results pages are search results where there is simply an answer in the answer box / featured snippet style, with zero organic search results on the page. For example, if you do a search for “time” or time with a time zone, Google may show a results page that has no organic results, but instead an answer box that simply shows the current time.
Google may be testing a feature in the search results where the people also search for box not only shows up when you click back from the web site, into the search results again but also when you hover your mouse cursor over the snippet.