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Tech websites love April Fools' gags - I'm sure they are part of every Silicon Valley marketing manager's strategy. Here's a list of places to get fooled online today.Wired offers 10 practical jokes for nerds - including rewiring a monitor to scramble the image and having word processors insert misspellings as someone types.Lifehacker is kinder with 10 harmless geek pranks.Popular Mechanics suggests 5 pranks you can build in the office.NASA reports that the ISS's new space robot suddenly demanded to be called "Dextre the Magnificent"Influential startup blog TechCrunch announced it would sue Facebook for $25m for misusing images of its founderReadWriteWeb lists 10 sites that do good pranks every yearGoogle has surpassed itself this year generating pages about services to send email back in time, search webpages not yet created, help you move to Mars and rickrolling millions by making every link on YouTube's homepage point to a Rick Astley video. A full list of Google's pranks is here.New Scientist is a victim of the last one - we were delighted to see our compelling video on cyborg insects featured on the YouTube front page until we clicked the link to see we had been RickRolled.Tom Simonite, online technology reporter