has showed vs has shown

Some examples from the web:

• Willie has showed me that losing our technology doesn't have to be the end of our learning.
• Steve Pinker has showed us that, in fact, we're living during the most peaceful time ever in human history.
• But Europe has showed you how to maintain a viable post office offering a universal service of excellent quality at an affordable price.
• The Kashmir conflict which broke out again in April/May 2002 and brought both countries to the brink of a nuclear conflict, has showed how dangerous it is to leave latent crises to develop, rather than taking preventive action to solve them.
• History has showed repeatedly that efforts to suppress languages breed contempt.
• I am surprised that your Mr. Compton has showed such restraint.
• The Government of Yemen has showed receptiveness to our demarches.
• I am surprised that your Mr. Compton has showed such restraint.
• The cat scan has showed that the cancer spread to your other vocal chord.
• I am disappointed that a compromise could not be found with the Council, which has showed itself to be quite unwilling to go forward.
• The investigation has showed on the basis of the information contained in the request and press articles that larger companies have increased their capacity.
• The Icelandic authorities have pointed out that despite the openness of the current shareholders to newcomers no company has showed interest in the project [54].
• We've been here 24 hours... ...and no one has showed up.
• Nevertheless, this debate has showed that there are such passionate views on many of these European issues that perhaps it is going to take a cool head to reconcile them all.
• One independent exporting producer in the country concerned, with a significant production capacity and significant sales to the Community, alleged that Company B has showed willingness to acquire it.
• The investigation has showed that the benefit of economies of scale no longer existed in a market where the utilization rates were low, which was also true for the Chinese producers.
• The investigation has showed that the benefit of economies of scale no longer existed in a market where the utilization rates were low, which was also true for the Chinese producers.
• The investigation has showed that the Community industry has suffered significant losses on the sales of black colorformer in the Community in the IP.
• Even though the European Commission has showed some difficulties in determining the next phases of its communication policy, the reductions proposed in this area are not coherent with the general political need to engage in a constant dialogue between EU institutions and citizens.
• With regard to cooperation, the Community has showed its willingness to contribute to a lasting development in Laos and an improvement in the living conditions of the people of Laos.

Some examples from the web:

• Garcinia cambogia has shown to aid weight loss.
• Science has shown sunsets and rainbows are illusions.
• The King has shown us mercy.
• Endovascular repair has shown benefit with respect to 30-day mortality.
• Research has shown a direct correlation between shoplifting and depression.
• But both development and research has shown otherwise.
• Research has shown that the application is distributed via bundled malicious installers.
• Research has shown that these vehicles are destroying our natural resources.
• Our Lord has shown us the light.
• Adam has shown me the way and there is nothing...
• She has shown nothing but grace and poise...
• She has shown nothing but grace and poise.
• See, Batman has shown Gotham your true colors, unfortunately.
• You show him the same disrespect that he has shown me.
• He has shown it on many occasions.
• He also has shown how complexity can arise out of a simple start.
• He has shown me nothing but anger.
• She has shown me a great many disturbing things.
• We'd like to honor a student who has shown outstanding leadership.
• But Kyle has shown nothing but love and concern for Amanda.